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Question 284713: How do I eliminate the fractions in the following problem: 1/5x - 3/5x =2 and 2/5x + 4/5x =3
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
How do I eliminate the fractions in the following problem:
(a) 1/(5x) - 3/(5x) = 2 and
(b) 2/(5x) + 4/(5x) = 3
~~~~~~~~~~~~~~~~~~~~~~~~


        In the post by @mananth, the answer is incorrect.
        I came to bring a correct solution.


(a) 1/(5x) - 3/(5x) = 2
Multiply the equation by 5x
((1/(5x))*5x - ((3/5x))*5x = 10x
1 - 3 = 10x
10x = -2
x = -2/10
x = -0.2

Solved correctly.

the second problem is solved in the similar manner




Question 275827: Solve for x.
(x+1)(x+3)(x+5)(x+7)=-15
I've worked this numerous times and get lost every time. Please explain how to find x.

Found 2 solutions by n2, ikleyn:
Answer by n2(79) About Me  (Show Source):
You can put this solution on YOUR website!
.
Equations/275827: Solve for x.
(x+1)(x+3)(x+5)(x+7)=-15
I've worked this numerous times and get lost every time. Please explain how to find x.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Your starting equation is

    (x+1)(x+3)(x+5)(x+7) = -15.    (1)


Although it leads to the fourth degree polynomial equation, it admits analytical solution
not of transcendent level of complexity.


Let y = x+4.  Then

    x+3 = y-1,  x+5 = y+1,  x+1 = y-3,  x+7 = y+3.


Therefore, equation (1) can be equivalently written in this form

    (y-3)*(y-1)*(y+1)*(y+3 = -15.    (2)


Regrouping the terms, we get

    (y^2-9)*(y^2-1) = -15,

     y^4 - 9y^2 - y^2 + 9 = -15,

     y^4 - 10y^2 +24 = 0,

     (y^2-6)*(y^2-4) = 0.


Therefore, four routs of equation (2) are

    y%5B1%5D = sqrt%286%29,  y%5B2%5D = -sqrt%286%29,  y%5B3%5D = -2,  y%5B4%5D = 2.


From here, the solutions to equation (1) are

    x%5B1%5D = -4%2Bsqrt%286%29,  x%5B2%5D = -4-sqrt%286%29,  x%5B3%5D = -2-4 = -6,  x%5B4%5D = 2-4 = -2.



ANSWER.  The solutions to the given equation are x%5B1%5D = -4%2Bsqrt%286%29,  x%5B2%5D = -4-sqrt%286%29,  x%5B3%5D = -2-4 = -6,  x%5B4%5D = 2-4 = -2.

Solved.



Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Solve for x.
(x+1)(x+3)(x+5)(x+7)=-15
I've worked this numerous times and get lost every time. Please explain how to find x.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


        The post by @mananth does not contain and does not give a complete solution.
        I came to do this job from the beginning to the end.


Your starting equation is

    (x+1)(x+3)(x+5)(x+7) = -15.    (1)


Although it leads to the fourth degree polynomial equation, it admits analytical solution
not of transcendent level of complexity.


Let y = x+4.  Then

    x+3 = y-1,  x+5 = y+1,  x+1 = y-3,  x+7 = y+3.


Therefore, equation (1) can be equivalently written in this form

    (y-3)*(y-1)*(y+1)*(y+3 = -15.    (2)


Regrouping the terms, we get

    (y^2-9)*(y^2-1) = -15,

     y^4 - 9y^2 - y^2 + 9 = -15,

     y^4 - 10y^2 +24 = 0,

     (y^2-6)*(y^2-4) = 0.


Therefore, four routs of equation (2) are

    y%5B1%5D = sqrt%286%29,  y%5B2%5D = -sqrt%286%29,  y%5B3%5D = -2,  y%5B4%5D = 2.


From here, the solutions to equation (1) are

    x%5B1%5D = -4%2Bsqrt%286%29,  x%5B2%5D = -4-sqrt%286%29,  x%5B3%5D = -2-4 = -6,  x%5B4%5D = 2-4 = -2.



ANSWER.  The solutions to the given equation are x%5B1%5D = -4%2Bsqrt%286%29,  x%5B2%5D = -4-sqrt%286%29,  x%5B3%5D = -2-4 = -6,  x%5B4%5D = 2-4 = -2.

Solved.




Question 263280: Given the equations 3x + y = 17, 5y + z = 14 and 3x + 5z = 41, what is the value of the sum x + y + z?
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Given the equations 3x + y = 17, 5y + z = 14 and 3x + 5z = 41, what is the value of the sum x + y + z?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~


        There is a way much shorter and much more elegant to solve the problem
        than the method used by @mananth.

        See my solution below.


Your starting equations are

    3x +  y = 17, 
    5y +  z = 14 ,
    3x + 5z = 41.


Add all three equations.  You will get

    6x + 6y + 6z = 17 + 14 + 41,

or

    6(x + y + z) = 72.


Divide both sides by 6

    x + y + z = 72/6 = 12.


At this point, the problem is just solved completely.


ANSWER.  x + y + z = 12.

Solved in the shortest way.

I am 129% sure that the true meaning and the destination of this problem
is to teach you to solve it by this short and elegant method.




Question 261692: please help need this one problem solved asap.
solve for x if the perimeter is 32.

one side of the weird looking triangle is 3,the other side is
x+7,and on the bottom is 2x-2 please someone help me..

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
please help need this one problem solved asap.
solve for x if the perimeter is 32.
one side of the weird looking triangle is 3,the other side is
x+7,and on the bottom is 2x-2 please someone help me.
~~~~~~~~~~~~~~~~~~~~~


        The solution by @mananth is  FATALLY  WRONG  due to his arithmetic errors.
        See my correct solution below.


The sides are 3 units, (x+7) units and (2x-2) units.

The equation for the perimeter is

    3 + (x+7) + (2x-2) = 32.


Simplify and find x

    3 + x + 7 + 2x - 2 = 32,

      x + 2x = 32 - 3 - 7 + 2,

        3x   =       24

         x   =       24/3 = 8 units.    <<<===---  ANSWER


The sides of the triangle are  3 units, 8+7 = 15 units and 2*8-2 = 14 units.


CHECK.  The perimeter is  3 + 15 + 14 = 32 units.    ! correct !

Solved correctly.




Question 1115269: Meisha has $25,000 that she wants to invest. She invests it in accounts paying 12%, 7%, and
6% simple interest. The account paying 12% is a higher-risk account, so she wants the
amount in that account to be half of the amount she has in the account paying 6% simple
interest. If her annual interest is $1945, how much is invested at each rate?

Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
         AMOUNT IN ACCOUNT      RATE(%)        INTEREST
               x                 12             0.12x
              25000-x-2x          7             0.07(25000-x-2x)
               2x                 6             0.06*2x

TOTALS       25000                              1945

0.12x%2B0.07%2825000-x-2x%29%2B0.06%2A2x=1945
-
12x%2B7%2825000-3x%29%2B6%2A2x=194500
24x%2B7%2A25000-21x=194500
3x=194500-7%2A25000
3x=19500
highlight%28x=6500%29
6500 at 12%
13000 at 6%
5500 at 7%

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Meisha has $25,000 that she wants to invest. She invests it in accounts paying 12%, 7%,
and 6% simple interest. The account paying 12% is a higher-risk account, so she wants the
amount in that account to be half of the amount she has in the account paying 6% simple
interest. If her annual interest is $1945, how much is invested at each rate?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


        For this problem (and for many other similar problems) there is much more simpler
        and more straightforward way to solve, which I will show you right now.


Let 'x' be the amount invested at 12%.

Then the amount invested at 6% is 2x, 

and the amount invested at 7% is the rest (25000 - x - 2x) = (25000-3x) dollars.


Now write an equation for the total annual interest 

    0.12x + 0.06(2x) + 0.07*(25000-3x) = 1945  dollars.


Simplify and find x

    0.12x + 0.12x + 1750 - 0.21x = 1945,

    0.12x + 0.12x - 0.21x = 1945 - 1750,

             0.03x         =    195

                 x         =    195/0.03 =  6500  dollars.


Thus, $6500 was invested at 12%;  2*6500 = 13000 dollars were invested at 6% and the rest, 
25000-13000-6500 = $5500  were invested at 7%.

Solved.

I neither used a system of three equation nor a system of two equations.

One equation in one unknown was enough to find all three unknowns.

It is a focus-pocus, which works successfully in many other similar problems.




Question 964216: if 8 men can do a job in 12 days how long will 24 men take to complete it

Answer by MathTherapy(10806) About Me  (Show Source):
You can put this solution on YOUR website!
if 8 men can do a job in 12 days how long will 24 men take to complete it
*************************************************************************
I wonder where these people, the likes of the other person who responded, get their math ideas from, and their ability, err,
inability to solve simple math problems, as well as their failure to realize that certain answers DON'T make sense, at all.

Here we're talking about 8 mwn doing a job in 12 days. Assuming 24 men work at the same rate as the 8, how can these 24
complete the job in 3 times the time it takes the 8 men? This is ABSOLUTELY ABSURD.

The CORRECT answer is SIMPLY: %288%2A12%29%2F24+=+highlight%28matrix%281%2C2%2C+4%2C+days%29%29!!! Now, isn't this answer logical? Doesn't it look and sound right?


Question 1179662: Divide 75 into two parts so that one part is 2/3 of the other.
Found 2 solutions by n2, ikleyn:
Answer by n2(79) About Me  (Show Source):
You can put this solution on YOUR website!
.

It is my cumulative review #2 to solutions by @mananth at this forum.
For my previous cumulative review #1 see the link
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1130236.html

From Jan.9, 20026 and during Jan. 2026 I continued checking solutions
provided by @mananth at this forum www.algebra.com .

For now, Feb.03, 2026, I reviewed/checked about 2*17*31 = 1054 problems, solved
by @mananth at this web-site (problems from 0..29 to 1260..1289 inclusively
of the list https://www.algebra.com/tutors/your-answers.mpl?userid=mananth ).

Of them, I found about 83 problems solved incorrectly.
Below is the list of these problems, solved incorrectly.
For each of these problems, my correct solution is placed at the same spot/link.

I started this my checking job from some of the problems, and after checking approximately 70 problems,
I started noticing the repeating patterns in problems and in their solutions.
Quite often, these solutions were incorrect, and the errors were of the kind a live person would not
make them. It led me to the idea that the solution were actually produced not by a living person,
but by a computer code, instead. So, it was a very early version of the Artificial Intelligence.

After getting this observation, two ideas led me.

First idea was, of course, to clean this forum from erroneous solutions.
Second idea was to learn how far this artificial intelligence may lead in producing wrong and right solution.
So, this file is my report on this issue.

I collected here only wrong solutions (wrong from a Math point of view).
There were also cases, when the solutions were led to correct answers, but were wrong
from an educative/pedagogical point of view. Then suggestions "wrong/correct" become more individualized/personalized,
and I did not include such cases in this my file. So, only incorrect solutions are collected/listed here.

From about 1000 reviewed problems, the number of incorrectly solved is about 80 (for now).
In other words, about 8% of all problems were solved incorrectly by @mananth (by his version of AI).

961374
Kyle Wong loans $12,000 to his brother-in-law. He will be repaid at the end of 9 years with interest at 8% compounded semiannually. Find out how much will be repaid.
https://www.algebra.com/algebra/homework/NumericFractions/Numeric_Fractions.faq.question.961374.html

1206359
The temperature in a town varies by 15 degrees F. The average temperature is 73 degrees F.
What is the correct absolute value equation?
https://www.algebra.com/algebra/homework/absolute-value/absolute-value.faq.question.1206359.html

1166470
From a cylindrical object of diameter 70cm and height 84cm a right solid cone having is base as one of circular ends
of the cylinder and with height 84cm is removed. calculate the area of the remaining solid object and calculate the
remaining solid object (take pia radius to be 22/7)
https://www.algebra.com/algebra/homework/Volume/Volume.faq.question.1166470.html

801507
The wheels on a certain bicycle have a radius of 13.2 inches. Suppose the wheels roll at 150 revolutions per minute
along flat ground without slipping. How fast is the bicycle moving in miles per hour?
https://www.algebra.com/algebra/homework/conversion/Reduction-of-unit-multipliers.faq.question.801507.html

1206316
How do you solve sin x + square root of 2 = - sin x on the interval -pi/2 < x < pi/2
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1206316.html

1206174
An egg tart costs $1.60. Each person is entitled to buy another 2 egg tarts at $1.30 each after buying 3 egg tarts.
Find the maximum you can buy with $24.00 and how much money would be left over.
https://www.algebra.com/algebra/homework/Human-and-algebraic-language/Human-and-algebraic-language.faq.question.1206174.html

1205048
a hawk sitting on a tree branch spots a mouse on the ground 15 feet from the base of the tree.
the hawk swoops down toward the mouse at an angle of 30 degree.
what is the distance from the tree branch to the mouse?
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1205048.html

1205029
A heavy cube of side 8cm is placed vertically in a cylindrical tank of radius 7cm which contains water.
Calculate the rise in the water level if the original depth of water was:
a) 10cm
b) 2cm
https://www.algebra.com/algebra/homework/playground/test.faq.question.1205029.html

1205036
14x squared = 7x
https://www.algebra.com/algebra/homework/Expressions-with-variables/Expressions-with-variables.faq.question.1205036.html

1205024 (10)
In a right angle triangle ABC side AC is 4 cm shorter than the hypotenuse and side BC is also 4 cm shorter
than the hypotenuse. Find the dimensions of the triangle.
https://www.algebra.com/algebra/homework/Problems-with-consecutive-odd-even-integers/Problems-with-consecutive-odd-even-integers.faq.question.1205024.html

1204592
An amount of money is invested at 12%/a interest. Write an equation and solve it to determine the length of time it will take for each of the following events to occur. Round answers to the nearest tenth of a year.
- the original amount to double if interest is compounded annually
- the original amount to triple if interest is compounded monthly
https://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.1204592.html

1048028
the ratio of mr paul's salary to mrs anna's salary is 3:4. if mrs anna draws a salary of Rs 28000,
find mr. paul's salary.
https://www.algebra.com/algebra/homework/formulas/Geometric_formulas.faq.question.1048028.html

1198148
You have $300,000 saved for retirement. Your account earns 8% interest.
How much will you be able to pull out each month, if you want to be able to take withdrawals for 15 years?
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1198148.html

1198906
Assume that you want to have $ 1900 saved in a sinking fund in 1 year. The account pays 3.5% compounded monthly.
What should be your monthly payments?
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1198906.html

1202648
Bob and his brother Jim live 95 miles apart and like to meet and play golf together,
the course is 15 miles further for Bob as it is from Jim but Bob averages 10 mph faster
than Jim so if they want to meet at the course at 9:00 and Jim leaves at 8:00
what time would Bob need to leave?
https://www.algebra.com/algebra/homework/coordinate/word/Linear_Equations_And_Systems_Word_Problems.faq.question.1202648.html

930689
Find the smallest natural number that is simultaneously the sum of 9, 10 and 11 consecutive integers.
https://www.algebra.com/algebra/homework/real-numbers/real-numbers.faq.question.930689.html

1202470
Find S17 for the series 8 - 4 + 2 - 1+ ...
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1202470.html

1202468
Calculate the sum between and including the terms t16 and t53 of an arithmetic sequence with first term 543 and common difference - 12
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1202468.html

1202418
The freight train headed south at 9 a.m. and the express train headed north from the same station at noon.
At 3 p.m., the trains were 420 miles apart. What was the speed of each if the speed of the express train
was 20 mph greater than the speed of the freight train?
https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.1202418.html

1202411 (20)
Which of the following equations represent the product of two consecutive odd
integers that equal 63?
A x(x − 1) = 63
B x(x + 1) = 63
C x(x − 2) = 63
D x(x + 2) = 63
E (x + 9)(x − 7) = 0
F (x + 9)(x + 7) = 0
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1202411.html

1205956
The third term of a g.p is 12 and the first term is 48.find the sum of the first 11 terms
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1205956.html

1079272
Mr chen deposit a certain sum of money in a bank in the interest rate of the bank decreases from 3.75% per annum to 3.5% per annum. Mr chen's interest will decrease by $50 in a year. find the sum of money he deposites
https://www.algebra.com/algebra/homework/Pythagorean-theorem/Pythagorean-theorem.faq.question.1079272.html

1112673
worker is employed to work for 30 days at the rate of Rs 120 per day. If he is absent on a particular day he loses Rs 30.
The worker earns total of Rs 2700 for that period. For how many days was the worker absent?
https://www.algebra.com/algebra/homework/coordinate/Linear-systems.faq.question.1112673.html

1186851
Douglas invests money in two simple interest accounts. He invests three times as much in an account paying 14% as he does
in an account paying 5%. If he earns $152.75 in interest in one year from both accounts combined, how much did he invest altogether?
Total Principal in Both Accounts = $
https://www.algebra.com/algebra/homework/coordinate/Linear-systems.faq.question.1186851.html

1202331
Ten years ago Linda was three times christys age then. Ten years from now christys age will be 4/7 of Linda’s age then.
How old are they now.
https://www.algebra.com/algebra/homework/word/age/Age_Word_Problems.faq.question.1202331.html

1204592
An amount of money is invested at 12%/a interest. Write an equation and solve it to determine the length of time it will take
for each of the following events to occur. Round answers to the nearest tenth of a year.
- the original amount to double if interest is compounded annually
- the original amount to triple if interest is compounded monthly
https://www.algebra.com/algebra/homework/logarithm/logarithm.faq.question.1204592.html

1204363
Write an equation that can form a linear system of equations with -2x + y = 4 so that the system has:
a) no solution _______________
b) many solutions _______________
c) one solution _______________
https://www.algebra.com/algebra/homework/coordinate/Linear-systems.faq.question.1204363.html

1202261
construction crew wants to hoist a heavy beam so that it is standing up straight. They
tie a rope to the beam, secure the base, and pull the rope through a pulley to raise one end
A of the beam from the ground. When the beam makes an angle of 40o with the ground, the
top of the beam is 8 ft above the ground.
The construction site has some telephone wires crossing it.. The workers are concerned
that the beam may hit the wires. When the beam makes an angle of 60o with the ground,
the wires are 2 ft above the top of the beam. Will the beam clear the wires on its way to
standing up straight? Explain your answer
https://www.algebra.com/algebra/homework/Length-and-distance/Length-and-distance.faq.question.1202261.html

1201865
The following 7 × 22 grid is divided into squares that are 1 unit by 1 unit.
WebAssign PlotThe shortest possible path on this grid from A to B is 29 units long. One such path is shown in the figure.
Let X be the set of all 29-unit-long paths from A to B.
Compute |X|, the number of 29-unit-long paths from A to B.
https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1201865.html

1201799 (30)
Finance/1201799: M wishes to determine how long it will take an initial deposit of $10,000 to double.
Required:
a) If M earns 10% annual interest on the deposit, how long will it take for him to double his money?
b) How long will it take if he earns only 7% annual interest?
c) Reviewing your findings in parts a and b, indicate what relationship exists between the interest rate
and the amount of time it will take M to double his money.
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1201799.html

1201644
Find the probability that the sum is as stated when a pair of dice is rolled. (Enter your answers as fractions.)
A. even and doubles
B. even or doubles
https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1201644.html

1201515
You have $500,000 saved for retirement. Your account earns 7% interest.
How much will you be able to pull out each month, if you want to be able
to take withdrawals for 20 years?
https://www.algebra.com/algebra/homework/playground/test.faq.question.1201515.html

1200913
What monthly payment is required to amortize a loan of $50,000 over 10 years if interest at the rate of 6%/year is charged
on the unpaid balance and interest calculations are made at the end of each month? (Round your answer to the nearest cent.)
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1200913.html

1201213
After 21% had been deducted for taxes, Formica's pay was $82.95. How much was Formica's pay before taxes were deducted?
https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Rate-of-work-word-problems.faq.question.1201213.html

1201069
You invest $ 5000 in Acme Inc. on January 1, 2000. Your investment returns 2.75 % compounded monthly.
How much money will you have on June 30, 2006?
https://www.algebra.com/algebra/homework/word/finance/Money_Word_Problems.faq.question.1201069.html

1201052
A black car travelled from a to c at 60km per hour. A blue car took 4 hours to travel the same distance. Both cars passed b at 2pm
and the blue car reached c at 3pm. If b was 80km from c , what time did the black car leave a .
https://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.1201052.html

1189904
Shauna is buying a laptop computer. she will pay 8% sales tax on the price before any rebates. where will she get a better buy?
XYZ-Tronic
price - $629
mail-in rebate $150
TEC-U-COMP
price - $649
discount 25% off
https://www.algebra.com/algebra/homework/proportions/Proportions.faq.question.1189904.html

1189951
A 0.22 kg red striped pool ball is moving at 3.0 m/s North and it collides with a white cue ball
that is 0.25 kg and it is moving at 1.0 m/s South. After the collision, the red striped ball continues
at 2.5 m/s North. What is the velocity of the white cue ball?
https://www.algebra.com/algebra/homework/Length-and-distance/Length-and-distance.faq.question.1189951.html

1201106
A vertical aerial AB 9.6m high stands on ground which is inclined 12 degrees to the horizontal.
A stay connects the top of the aerial A to a point C on the ground 10m downhill from B the foot of the aerial.
Determine the length of the stay and the angle the stay makes with the ground.
https://www.algebra.com/algebra/homework/formulas/Geometric_formulas.faq.question.1201106.html

1182886 (40)
WRITE THE EQUATION OF THE LINE PARALLEL TO 4X-5Y-10=0 THAT PASSES THROUGH (0,-3).
https://www.algebra.com/algebra/homework/Linear-equations/Linear-equations.faq.question.1182886.html

1182721
I think of a number. I multiply it by 5. I then subtract 19. Finally, I double the result. The result is 22.
Find the original number.
https://www.algebra.com/algebra/homework/word/numbers/Numbers_Word_Problems.faq.question.1182721.html

1182591
A 0.5 kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 8.0 N
for a distance of 4.0 m how much kinetic energy does the block gain
https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.1182591.html

1182486
A twin engine pontoon boat can cross the river in 18 hours when both engines are operating. It takes 27 hours longer for the boat
to cross the river using only engine one than it does when using only engine two. How long would it take each engine working alone
to power the boat so it can cross the river? Use lowercase variable t for time and write a quadratic equation to model this problem.
https://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.1182486.html

1201069
You invest $ 5000 in Acme Inc. on January 1, 2000. Your investment returns 2.75 % compounded monthly.
How much money will you have on June 30, 2006?
https://www.algebra.com/algebra/homework/word/finance/Money_Word_Problems.faq.question.1201069.html

1182444
The track is a 500 m circuit. Ali practices running at a speed of 10kph. Ben practices cycling and travels at 25kph.
How long does Ali take to run one lap?
https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.1182444.html

1182443
What is the momentum of a fuel tanker moving to the west that has a loaded tonnage of 800000 tons
( lets use metric tons .. 1 ton = 1000 kg ) and a speed of 36.0 mph in kg*m/s
https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.1182443.html

1182271
A ball is dropped from a height of 32 m. The ball bounces back 80 % of the distance it falls.
To what height does the ball bounce after the 5th bounce? Round answers to one decimal place.
https://www.algebra.com/algebra/homework/Functions/Functions.faq.question.1182271.html

1182420
How long will it take $3,000 to grow to $14,000 if it is invested at 5% compounded monthly?
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1182420.html

1182343
A store was purchased for 725,000 and the buyer made a 10% down payment. The balance was financed
with a 6.35% loan for 27 years. Find the monthly payment.
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1182343.html

1181645 (50)
The ball of a float valve has a diameter of 4 in., and the thickness of the metal is 0.05 in.
How much does it weigh if it is made of copper? (Copper weighs 556 lb. per cu. ft.)
https://www.algebra.com/algebra/homework/Bodies-in-space/Bodies-in-space.faq.question.1181645.html

1181614
What is the solution to the system?
-x-2y=2
2x+3y=-3
https://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.1181614.html

1181560
Write the equation of the line in slope-intercept form with slope of -3 passing through the point (6, -2).
https://www.algebra.com/algebra/homework/Linear-equations/Linear-equations.faq.question.1181560.html

1181419
the standard form of the equation of the line that passes through
(1/2, 2) and has slope -4.
https://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.1181419.html

1181125
Given: cos A = 3/5, tan B = 12/5, A is in Quadrant 1 and is in Quadrant 3
Find
1.Sin (A + B)
2.Sin (A - B)
3.Cos (A + B)
4.Cos (A - B)
5.Tan (A - B)
6.Tan ( A+ B)
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1181125.html

1181029
A 3-inch diameter hole is drilled 6inches deep into the center and normal to the top face of brass cube 8 inches
on the side. The hole is filled with lead. If a brass weighs 525lb/ft^3 and the lead weighs 705lb/ft^3.
Find the total mass of the two metals
https://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.1181029.html

1180923
Circles/1180923: What is the value of c? (The picture of the circle is in the link below):
https://www.founderseducation.net/assets/images/84e9774a7a34720147b8049cfd04dc7a5795ec5c.png
https://www.algebra.com/algebra/homework/Circles/Circles.faq.question.1180923.html

1180833
The sides of a triangle are 70cm, 80cm, and 90 cm. Compute the length of the altitude to the 80-cm side.
https://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.1180833.html

1180511
Find the equation of the line which passes through point (1,1) and is perpendicular to line AB which passes through points A(1,-2) and B(5,6).
https://www.algebra.com/algebra/homework/Points-lines-and-rays/Points-lines-and-rays.faq.question.1180511.html

1180346
A tree that is 8 feet tall is growing at a rate of 2 feet each year. Another tree that is 10 feet tall is growing at a rate
of 1 foot each year. Determine how many years it will take for the two trees to reach the same height.
https://www.algebra.com/algebra/homework/coordinate/Linear-systems.faq.question.1180346.html

1180052 (60)
The half-life of the substance is 10 years. If we begin with 20 g of the substance, how much will be left after 5 years?
https://www.algebra.com/algebra/homework/Exponential-and-logarithmic-functions/Exponential-and-logarithmic-functions.faq.question.1180052.html

1179655
The bird capable of the fastest flying speed is the swift. A swift flying with the wind to a favorite feeding spot
traveled 42 mi in 0.3 h. On returning, now against the wind, the swift was able to travel only 27 mi
in the same amount of time. What is the rate of the swift in calm air, and what was the rate of the wind?
https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Rate-of-work-word-problems.faq.question.1179655.html

1180054
Quadratic_Equations/1180054: What number should be added to the equation 2 x squared plus 8 x minus 5 equals 0
if you will use completing the square?
https://www.algebra.com/algebra/homework/quadratic/Quadratic_Equations.faq.question.1180054.html

1179662
Divide 75 into two parts so that one part is 2/3 of the other.
https://www.algebra.com/algebra/homework/equations/Equations.faq.question.1179662.html

1179537
Could anyone help me with the next questions I sent.
If angle a and angle b is same-side interior angles, and a is 30 degrees, what is angle B?
https://www.algebra.com/algebra/homework/Angles/Angles.faq.question.1179537.html

1179401
Peter and Steven take 5 1/3 hours to do a job. Steven alone takes 16 hours to
do the same job. How long would it take Peter to do the same job alone?
https://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Rate-of-work-word-problems.faq.question.1179401.html

1179536
If angle a and angle b are vertical angles and angle a is 90 degrees, what is angle B?
https://www.algebra.com/algebra/homework/Angles/Angles.faq.question.1179536.html

1179513
The vertices of a triangle are P(-6,1), Q(-2,-5) and R(8,1).
Find the equation of the perpendicular bisector of the side QR.
Find the slope of the median of the triangle that passes through point R.
Find the slope of the altitude of the triangle that passes through point Q.
https://www.algebra.com/algebra/homework/word/geometry/Geometry_Word_Problems.faq.question.1179513.html

1179874
find a[n] for each geometric sequence a[12] for 96, 48, 24, ...
https://www.algebra.com/algebra/homework/Sequences-and-series/Sequences-and-series.faq.question.1179874.html

1179761
The sum of two whole numbers is 29. find the maximum possible product of the two numbers.
https://www.algebra.com/algebra/homework/Human-and-algebraic-language/Human-and-algebraic-language.faq.question.1179761.html

1179689 (70)
/AB/ IS A CHORD OF A CIRCLE OF RADIUS 10CM,M IS A MID-POINT OF /AB/ AND /NM/ PERPENDICULAR TO /AB/,IF /MN/=2CM CALCULATE /AB/
https://www.algebra.com/algebra/homework/Trigonometry-basics/Trigonometry-basics.faq.question.1179689.html

1179658
A plane traveling with the wind flew 1312.5 mi in 5.25 h. Against the wind, the plane required 6.25 h to fly the same distance. Find the rate of the plane in calm air and the rate of the wind.
https://www.algebra.com/algebra/homework/word/travel/Travel_Word_Problems.faq.question.1179658.html

1179190
Find the slope of the line through (-5,3) and (x+1, x-2).
https://www.algebra.com/algebra/homework/formulas/Geometric_formulas.faq.question.1179190.html

1178962
The area of a garden is 972 square feet, and the length of its diagonal is 45 feet. Find the dimensions of the garden.
https://www.algebra.com/algebra/homework/coordinate/word/Linear_Equations_And_Systems_Word_Problems.faq.question.1178962.html

1178941
Two six-sided dice are rolled. You are interested in getting the sum of the number of dots
in the two dice.
a. List all the possible outcomes.
b. What is the probability that the sum of the two dice is at least 6?
https://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.1178941.html

1178403
a closed cylindrical tank is 8 feet long and 3 feet in diameter.
when lying in a horizontal position, the water is 2 feet deep.
if the tank is the vertical position, the depth of water in the tank is?
https://www.algebra.com/algebra/homework/Bodies-in-space/Bodies-in-space.faq.question.1178403.html

1170459 <<<---=== wrong formulation to the problem and wrong solution, giving unrealistic answer
A train after travelling 50km meets an accident and and after reducing 3/4 of its former speed arrives 25min late.
If the accident occurred 24km behind it would have arrived 35 minutes late.
What is the speed and distance travelled by the train.
https://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.1170459.html

1198694
The sum of cube root of two numbers is 128,while the sum of the reciprocals of their cubes is 2. What are thosw two numbers.
https://www.algebra.com/algebra/homework/Square-cubic-other-roots/Square-cubic-other-roots.faq.question.1198694.html

1177099
Two kinds of fruits are displayed in a fruit stand. One is avocado fruit whose number is no more than thrice the other,
which is melon. How many avocado and melons are there if there are atleast 20 total of fruits displayed.
https://www.algebra.com/algebra/homework/Inequalities/Inequalities.faq.question.1177099.html

1192417
from the deck of 52 playing cards, how many ways can we choose 10 hearts and 10
https://www.algebra.com/algebra/homework/Permutations/Permutations.faq.question.1192417.html

1053994 (80)
If Jackson deposited $400 at the end of each month in the saving account earing interest at the rate of 6%/year compounded monthly,
how much will he have on deposite in his savings account at the end of 6 years, assuming that he makes no withdrawals during that
period? Round your answers to two decimal places.
https://www.algebra.com/algebra/homework/expressions/expressions.faq.question.1053994.html

​1198831
If a bank pays 15% compounded semi-annually, how much should be deposited now to have $1800 in 5 years from now?
https://www.algebra.com/algebra/homework/Finance/Finance.faq.question.1198831.html

1180616
pilot heads his jet due east. The jet has a speed of 680 km/h relative to the air. The wind is blowing due north with a speed of 64 km/h
Find the true speed and direction of the jet
https://www.algebra.com/algebra/homework/word/misc/Miscellaneous_Word_Problems.faq.question.1180616.html

1179966 (83)
Ellis is painting wooden fenceposts before putting them in his yard. They are each 5 feet tall and have a diameter of 1 foot.
There are 10 fenceposts in all. How much paint will Ellis need to paint all the surfaces of the 10 fenceposts? Use 3.14 for π,
and round your answer to the nearest hundredth.
https://www.algebra.com/algebra/homework/formulas/Geometric_formulas.faq.question.1179966.html


/\/\/\/\/\/\/\/\/\/\/\/


You may ask me - ok, @mananth is a computer code, or AI - what does it change ?

Ok, below are my thoughts and my suggestions about it.


(1)  First, 8.3% wrong solutions is too much for an AI.
     You may say "ok, in 20 years it will be perfect".
     Probably, it can be true, but I tell you about what I see now.

     By the way, my feeling is that good AI acceptable level for wrong solutions
     should be at most 1:1000, or 0.1%.



(2)  Second, it can be perfect in 20 years under one necessary condition: 
     the best minds in Math solving, writing and teaching, the best Math educators  
     and the best computer programming specialists will work on it 
     starting from now and during 20 years.


     What does it mean and why ? - Raising and educating a specialist in solving Math, writing Math 
     and explaining Math takes 10 - 15 - 20 years to get a professional level, when a person can speak, 
     write and teach professionally. (And, usually, the fingers of one hand are enough 
     to count such specialists of a national level in each country and in each generation).


     If you make such experiments with the novices, it will take 10-15-20 years for them to get a professional 
     level before they will learn to speak/write at the professional level, so it is a WRONG way to assign 
     novices for key positions for such an activity.


     It is the second conclusion from my arguments: the writers and the content creators must be professionals
     from the very beginning. Neither @mananth, nor @CPhill are such professionals.



(3)  Third, when a computer code (like Artificial Intelligence) produces wrong solutions, it becomes 
     double and triple dangerous, since it works as the source of unlimited erroneous solutions.

     So, such pretendent to the AI position is needed in doubled and tripled attention from developers,
     from well-wishers around and from the whole community.



     Often, I see the solutions by @mananth (= or his code) that produce correct final answer,
     but are incorrect from the point of view of the teaching methodology.

     When a computer code (like Artificial Intelligence) produces pedagogically wrong solutions, 
     then such tools become inappropriate for teaching - and again, they require doubled and tripled attention.



(4)  Fourth, the computer codes which I see in the posts by @CPhill or @mananth, have no that level of flexibility
     and precision to serve at the adequate level.  So, the level of the computer coders must be at least 
     one order (one level) higher.



(5)  Fifth, the writing, coding and programming discipline must be changed.

     For now, the AI codes for solving school Math problems that I saw so far, do not show a tendency 
     to make checks of their solutions. They do not think that is is MANDATORY.  It is a crude error, 
     which must be fixed.



(6)  Next.  As the life has taught me, many of incoming problems are mathematically non-sensical.
     So, the input flow is quite dirty, and therefore, idiotic incoming problems should be filtered out.

OK. So, these are conclusions and directions from my overview that should be taken into account by developers of AI,
if they want to have a perfect product in 20 years.


XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


OK and very good.

There is one more issue, which I hesitate to pronounce.

It is well known fact that the peak in school Math education in the world (in all industrially
developed countries) was from the middle of 1950s to, roughly say, 1970.
After that peak, the recession of the level of Math education was observed worldwide.

So and therefore, the specialists who are able to communicate with young students,
to speak with them, to teach them Math, to inspire them and who got their Math education at that time,
have a special value. People of this generation are quite old and will go out soon -
so and therefore, it is of great importance, great necessity and high urgency to use the experience
of those of them, who still have a potential to share their knowledge, skills, style, tone, spirit and abilities.

When these people will go out totally, it will be too late.



Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Divide 75 into two parts so that one part is 2/3 of the other.
~~~~~~~~~~~~~~~~~~~~~~~


        Calculations in the post by @mananth are incorrect.
        I came to bring a correct solution.


If one part is x
the other part will be 2x/3
x+ 2x/3 =75
(3x+2x)/3=75
5x = 225
x = 45
You can find the other part
2/3 x = 2/3 * 45 = 30.

ANSWER. The parts are 45 cm and 30 cm.

Solved correctly.




Question 356826: Hi, I was wondering if someone could help me. I have no idea how to complete this problem, and I need to show my work (steps). So, if anyone has any help they can provide, I would greatly appreciate it. Thank you.
Simplify

cubrt(27x^4y^10).

Explain your answer and show all steps.

Answer by MathTherapy(10806) About Me  (Show Source):
You can put this solution on YOUR website!
Hi, I was wondering if someone could help me. I have no idea how to complete this problem, and I need to 
show my work (steps). So, if anyone has any help they can provide, I would greatly appreciate it. Thank you. 

Simplify

cubrt(27x^4y^10).

Explain your answer and show all steps. 
=======================================
root+%283%2C+27x%5E4y%5E10%29
root+%283%2C+%283%5E3%29%28x%5E3+%2A+x%29%28y%5E9+%2A+y%29%29   
root+%283%2C+%283%5E3%29%28x%5E3%29x%28y%5E9%29y%29+++
highlight%283xy%5E3%2Aroot+%283%2C+xy%29%29


Question 1164822: Find the equation of the least squares regression line (line of best fit). Note: Use the number of phones sold in the month of February as the independent variable, x, and the commission on those sales as the dependent variable, y. (No work required.)

b. State the value of the correlation coefficient r and comment on the goodness of fit.



Plans sold(x) Commission(y)
14. 243
16. 312
17. 279
18. 308
11 199
15. 219
23. 504
24. 550
14. 260
17. 255

Answer by CPhill(2189) About Me  (Show Source):
You can put this solution on YOUR website!
```python
import numpy as np
from scipy import stats
import matplotlib.pyplot as plt
x = np.array([14, 16, 17, 18, 11, 15, 23, 24, 14, 17])
y = np.array([243, 312, 279, 308, 199, 219, 504, 550, 260, 255])
slope, intercept, r_value, p_value, std_err = stats.linregress(x, y)
print(f"{slope=}")
print(f"{intercept=}")
print(f"{r_value=}")
# For plotting
plt.scatter(x, y, color='blue', label='Data Points')
plt.plot(x, slope * x + intercept, color='red', label='Regression Line')
plt.xlabel('Plans Sold (x)')
plt.ylabel('Commission (y)')
plt.title('Least Squares Regression Line')
plt.legend()
plt.grid(True)
plt.savefig('regression_plot.png')


```
```text
slope=27.894409937888202
intercept=-158.51552795031063
r_value=0.9431913989966259

```
To find the least squares regression line and the correlation coefficient for the given data, we perform a linear regression analysis.
### a. Equation of the Least Squares Regression Line
Using the provided data, we calculate the slope () and the -intercept () for the equation .
* **Slope ():**
* **-intercept ():**
**The equation of the regression line is:**

---
### b. Correlation Coefficient and Goodness of Fit
The correlation coefficient () measures the strength and direction of the linear relationship between the two variables.
* **Correlation Coefficient ():**
**Comment on Goodness of Fit:**
A correlation coefficient of **0.9432** indicates a **very strong positive linear relationship** between the number of plans sold and the commission earned. Since is close to 1, the regression line provides an excellent fit for the data, meaning that as the number of plans sold increases, the commission tends to increase in a highly predictable manner.
Would you like me to use this equation to predict the commission for a specific number of sales, such as 20 plans?


Question 454369: Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form y=mx+b
(-6,7); 2x=9y+8

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Write an equation of the line containing the given point and parallel to the given line.
Express your answer in the form y=mx+b
(-6,7); 2x=9y+8
~~~~~~~~~~~~~~~~~~~~~~~~


        The solution and the answer in the post by @mananth both are incorrect.
        They are incorrect, since @mananth permanently rounds rational fractions to decimal fractions
        even when it is not allowed and ruins the precise form of equations.

        So,  I came to make the job in a right way as it  SHOULD  be done.


Any line parallel to  2x = 9y + 8  has the form

    2x = 9y + c,    (1)

where 'c' is a real constant.  To find 'c', we simply insert coordinates (-6,7) into equation (1)

    2*(-6) = 9*7 + c,

    -12 - 63 = c,

    c = -75.


Thus equation (1) takes the form

    2x = 9y - 75.    (2)


To get the form  y = mx + b, we express 'y' from equation (2)

    y = %282%2F9%29x + 75%2F9,

or,  which is the same

    y = %282%2F9%29x + 81%2F3.    (3)


So, the slope of the sough line is  m = 2%2F9  and its equation is  y = %282%2F9%29x + 81%2F3.

Solved correctly.




Question 454379: Find an eaution of the line containing the given pair of points.
( - 7, - 9) and ( - 4, - 8)

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Find an eqaution of the line containing the given pair of points.
(-7,-9) and (-4,-8)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


        The solution in the post by @mananth is incorrect both technically and methodologically.
        I came to bring a correct solution.


First find the slope of the line  

    m = %28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29 = %28-8+-+%28-9%29%29%2F%28-4+-+%28-7%29%29 = %28-8%2B9%29%2F%28-4%2B7%29 = 1%2F3.


Notice that  -1%2F3  is not -0.33,  as @mananth mistakenly states and uses.


Plug the value of the slope and the values of the coordinates (-7,-9) of the given point  
in the point-slope equation of the line 

    y = mx + b,

    -9 = %281%2F3%29%2A%28-7%29 + b,

    b = -9 + 7%2F3 = %28-27%2B7%29%2F3 = -20%2F3 = -62%2F3.


So, an equation is

    y = %281%2F3%29x - 62%2F3.


It is the slope-intercept form equation.


Notice that it is absolutely different from that in the post by @mananth.

Solved correctly.




Question 451061: Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form Y=MX+b.
(-3,3);4x=5y+6
The equation of the line is Y=
(Simplify your answer. Use integers or fractions for any numbers in the expression)

Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
Point (-3,3)
Parallel to 4x=5y%2B6

4x-5y=6
Keep coefficients the same for "parallel".
4x-5y=p
4%2A%28-3%29-5%283%29=p
-12-15=p
-27=p

Equation wanted is 4x-5y=-27, or in whatever form you want for the equivalent equation.

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Write an equation of the line containing the given point and parallel to the given line.
Express your answer in the form Y=MX+b.
(-3,3);4x=5y+6
The equation of the line is Y=
(Simplify your answer. Use integers or fractions for any numbers in the expression)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


A standard consideration and treatment for this case is as follows.


Any line parallel to the line 4x = 5y + 6 has the form 4x = 5y + c,
where 'c' is some constant.


So, the only thing we should do to solve the problem is to find
this constant 'c' from this equation. For this, we substitute the coordinates
of the given point into this equation

    4*(-3) = 5*3 + c,

    -12 = 15 + c,

    c = -12 - 15 = -27.


Thus the sought equation is

    4x = 5y - 27.


If you want it in the slope-intercept form, express 'y'

    y = %284%2F5%29x + 5.4.

That is all. At this point, the problem is solved completely.




Question 448337: What is the answer to this equation 2x/5 = 4+2/3 ? If Not the answer how do i solve this equation?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
Exactly as written, 2x/5 = 4+2/3
2x%2F5+=+4%2B2%2F3

5%2A3%282x%2F5%29=5%2A3%2A%284%2B2%2F3%29
6x=60%2B10
6x=70
x=70%2F6
highlight%28x=35%2F3%29

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
What is the answer to this equation 2x/5 = 4+2/3 ? If Not the answer how do i solve this equation?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


The answer  ' 11.66 '  in the post by @mananth is incorrect.

The correct answer is   70%2F6 = 114%2F6 = 112%2F3,

which is not  11.66,  as @mananth mistakenly states.




Question 447396: I need help writing the slope-intercept equation for the line that passes through (-3, -15) and is perpendicular to -6x + 8y = 3. Thank you.
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
I need help writing the slope-intercept equation for the line that passes through (-3, -15)
and is perpendicular to -6x + 8y = 3. Thank you.
~~~~~~~~~~~~~~~~~~~~~


        The  " solution "  in the post by @mananth is  INCORRECT.
        Speaking in soft manner,  it is absurdist,  since he identifies the values  -4/3  and  -1.33,
        although they are absolutely different,  as any  5th grade student knows.

        Therefore,  I will re-write his solution to present it in correct form.


Your starting equation is

    -6x + 8y = 3.


Find the slope of this line

    m1 = 6%2F8 = 3%2F4.


The slope of a line perpendicular to the above line will be the negative reciprocal m2 = -4%2F3.


Now we want to write an equation of a straight line with the slope m2 = -4%2F3 through point (-3,-15).


Write it in the form

    y = %28-4%2F3%29x + b.


We need to find a constant 'b'.

Find 'b' by plugging the values of x = -3,  y = -15 

    -15 = {{(-4/3)*(-3)}}} + b

    -15 = 4 + b

    b = -19


The required equation is y = %28-4%2F3%29x - 19.    ANSWER

Solved correctly.

In this kind of problems, @mananth runs his computer code,  which generates
incorrect solutions every time,  from problem to problem.

I just tired to disprove them.




Question 447238: 30% of the tickets sold by a movie theater were children's tickets at $4 ea. The rest of the tickets were sold at the full price of $8.50 ea. The theater collected $252 for the childrens tickets. How many tickets did they sell in all?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
Theatre sold some p tickets.
30 % of p contributed 252 dollars in sales.

0.3p%2A4=252
highlight%28p=210%29

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
30% of the tickets sold by a movie theater were children's tickets at $4 ea.
The rest of the tickets were sold at the full price of $8.50 ea.
The theater collected $252 for the children's tickets. How many tickets did they sell in all?
~~~~~~~~~~~~~~~~~~~~~~~


The theater collected $252 for the children's tickets.

So, the number of children tickets was  252%2F4 = 63.


Thus, 63 tickets were 30% of all sold tickets.

It means that the total number of tickets sold was  63%2F0.3 =210.


ANSWER.  The total numbers of tickets sold was 210.

Solved.


In this problem, the information about the adult tickets price is excessive: it is not used in the solution.




Question 730128: ind the effective rate corresponding to the given nominal rate. (Assume a 365-day year. Round your answer to two decimal places.)
7%/year compounded semiannually

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Find the effective rate corresponding to the given nominal rate.
(Assume a 365-day year. Round your answer to two decimal places.)
7%/year compounded semiannually
~~~~~~~~~~~~~~~~~~~~~~~~~~


    The effective annual rate is  %281%2B0.07%2F2%29%5E2-1 = 1.071225 - 1 = 0.071225.    ANSWER

Solved.

The number of days in the year is irrelevant in this problem.




Question 61355: 3/4n + 5 = 2/5n
Answer by MathTherapy(10806) About Me  (Show Source):
You can put this solution on YOUR website!
3/4n + 5 = 2/5n

I take it you need this solved!!

If this is %283%2F4%29n+%2B+5+=+%282%2F5%29n, then highlight%28n+=+-+100%2F7%29, not highlight%28n+=+-+25%2F13%29, as the other person states!


Question 732178: Given n=74 and x=32. Find ^ and ^
p q

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Given n=74 and x=32. Find ^ and ^
p q
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


As far as I can see it, it is nonsense.

Probably, a doctor is needed to decipher the meaning of this post,
but I am not a doctor.




Question 732220: How much water does it take to completely fill a pool that is 40 m long, 25 m wide, and 2 m deep?
m3

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
How much water does it take to completely fill a pool that is 40 m long, 25 m wide, and 2 m deep?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

40 * 25 * 2 = 2000  cubic meters of water.    ANSWER

Solved.




Question 733033: K squared minus 8K minus 48 equals 0

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
K squared minus 8K minus 48 equals 0
~~~~~~~~~~~~~~~~~~~~~~~~

k^2 - 8k - 48 = 0.

Factor left side

(k-12)*(k+4) = 0.

The roots are k = 12 and k = -4.

Solved.




Question 733074: The maximum weight for an elevator is 750 kg. 2 occupants enter the elevator, 1 weighs 110lb and the other is 230lb. What is the linear equation and how do I graph it/
Found 2 solutions by timofer, ikleyn:
Answer by timofer(155) About Me  (Show Source):
You can put this solution on YOUR website!
nice data. wrong question.

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.

100% nonsensical problem, composed by mathematically illiterate person,

who amuses himself in this way, suffering from idleness.




Question 666240: I am having a problem with this equation and don't seem to solve it.
the problem is to solve the equation:
(x-10)2/5 = (9x)1/5

Found 2 solutions by timofer, josgarithmetic:
Answer by timofer(155) About Me  (Show Source):
You can put this solution on YOUR website!
Both sides have denominator of 5.
%28x-10%29%282%2F5%29%285%29=%289x%29%281%2F5%29%285%29
%28x-10%29%282%29=%289x%29
2x-20=9x
9x-2x=-20
7x=-20
x=-20%2F7-----------------------------------or same as -2%266%2F7

Answer by josgarithmetic(39792) About Me  (Show Source):

Question 1166449: in a made up poll the proportion of people who like dark chocolate more than milk chocolate was 43% with a margin of error of 1.9% describe the conclusion of p(proportion) using an absolute value inequality using the
Answer by CPhill(2189) About Me  (Show Source):
You can put this solution on YOUR website!
The conclusion of the poll regarding the proportion ($p$) of people who prefer dark chocolate over milk chocolate can be described by the following absolute value inequality:
$$|p - 0.43| \leq 0.019$$
---
## Explanation
This inequality expresses that the true proportion ($p$) is estimated to be $0.43$, with a maximum possible difference (or error) of $0.019$ in either direction.
1. **Point Estimate:** The sample proportion is $43\%$, or **$0.43$**. This is the center of the confidence interval.
2. **Margin of Error ($E$):** The error is $1.9\%$, or **$0.019$**.
3. **Absolute Value Inequality:** The standard form for a confidence interval's conclusion is:
$$|\text{True Proportion} - \text{Sample Proportion}| \leq \text{Margin of Error}$$
### Confidence Interval (Expanded Form)
The inequality can be rewritten as a compound inequality:
$$-0.019 \leq p - 0.43 \leq 0.019$$
Adding $0.43$ to all parts gives the confidence interval:
$$0.43 - 0.019 \leq p \leq 0.43 + 0.019$$
$$0.411 \leq p \leq 0.449$$
The poll concludes that the true proportion of people who prefer dark chocolate is between **$41.1\%$ and $44.9\%$**.


Question 734978: How do you solve for x when the problem is: x/2 - 1/3 = 3/2?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
How do you solve for x when the problem is: x/2 - 1/3 = 3/2?
~~~~~~~~~~~~~~~~~~~~~~~~~~

Multiply all the terms by 2.  You will get

    x - 2/3 = 3.


Now add 2/3 to both sides to get

    x = 3 2/3.


ANSWER.  x = 3 2/3,  or  x = 11/3.

Solved.

The answer in the post by @lynnlo is incorrect.
For the peace in your mind, ignore his post.




Question 736996: Evaluate. Round to the nearest hundredth if necessary.
3√6
My book is confusing me and I have numerous problems like this. Can someone please break this down and show me how to do this. Thank you!

Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
Using a calculator is easiest way. Making use of table of square roots maybe another way.
More laborous way,
2%2A2=4
3%2A3=9
What to square to get 6?

2.1^2=4.41
2.2^2=4.84
2.3^2=5.29
2.4^2=5.76
2.5^2=6.25
Square root of 6 is something between 2.4 and 2.5.

2.42^2=5.8564
2.44^2=5.9536
2.46^2=6.0516
Square root of 6 is between 2.44 and 2.46.

2.45^2=6.0025
Is this close enough or do you want to find something closer?
Would 2.4495 work for you?

3%2Asqrt%286%29=3%2A2.4495=highlight%287.35%29, to the nearest hundredth

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Evaluate. Round to the nearest hundredth if necessary.
3√6
My book is confusing me and I have numerous problems like this. Can someone please break this down and show me how to do this. Thank you!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Use your calculator.




Question 736630: Reggie receives three points for each correct answer on a test and loses one point for each incorrect answer. Write an equation showing that Reggie received 60 points.
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Reggie receives three points for each correct answer on a test and loses one point
for each incorrect answer. Write an equation showing that Reggie received 60 points.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let x be the number of correct answers.

Let y be the number of incorrect answers.


For the total of 60 points, an equation is

    3x - y = 60.

This is what you asked for.




Question 744553: Alexis and Martin helped the school set chairs in rows for an assembly. They put the same number of chairs in each row. Using 92 chairs available, Alexis made 4 rows with 2 chairs left over while Martin made 5 rows with no chairs left over. Write and solve an equation that can be used to find the number of chairs in each row.
Found 2 solutions by timofer, ikleyn:
Answer by timofer(155) About Me  (Show Source):
You can put this solution on YOUR website!
c, the number of chairs in each row
Alexis: 4c+2 chairs
Martin: 5c chairs

The sum of each person's chairs is 92 so
%284c%2B2%29%2B5c=92
9c%2B2=92
9c=90
highlight%28c=10%29-------10 chairs in each row

Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Alexis and Martin helped the school set chairs in rows for an assembly.
They put the same number of chairs in each row.
Using 92 chairs available, Alexis made 4 rows with 2 chairs left over
while Martin made 5 rows with no chairs left over.
Write and solve an equation that can be used to find the number of chairs in each row.
~~~~~~~~~~~~~~~~~~~~~~~~~~~

Let 'n' be the number of chairs in each row.


Write an equation as you read the problem

    set by   set by    total
    Alexis   Martin

    (4n+2)  +  5n     = 92.


Solve and find n

    9n = 92 - 2

    9n = 90

     n = 90/9 = 10.


ANSWER.  10 chairs in each of 9 rows plus 2 chairs left over.

Solved.




Question 614617: A car travels at a constant speed of 15m/s. How many miles does the car travel in 15 sec
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
A car travels at a constant speed of 15m/s. How many miles does the car travel in 15 sec
~~~~~~~~~~~~~~~~~~~~~~~~~~


        The other tutor misread the problem.
        I came to bring a correct solution.


Dimension of speed  ' m/s ' means, by default, 'meters per second'.
It can not have any other meaning, by the common agreement.


So, the car has a constant speed of 15 meters per second.
In 15 seconds, the car moves 15*15 = 225 meters.


We should convert 225 meters to miles.
1 mile = 1609.34 meters


So, to make this conversion, we should divide 225 meters by 1609.34 meters per mile.


The division gives  225 meters = 225%2F1609.34 = 0.1398  of a mile .   <<<---===ANSWER

Solved.




Question 203989: Jon throws all his nickels and dimes in a jar at home each day. He counted all his coins one day and found that he had collected $42.35. If there were five times as many nickels as dimes how many of each coin does he have?
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Jon throws all his nickels and dimes in a jar at home each day.
He counted all his coins one day and found that he had collected $42.35.
If there were five times as many nickels as dimes how many of each coin does he have?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


        This is a typical example of problems on coins
        that can be solved  MENTALLY  in couple of lines without using any equations.


According to the problem, we can group all coins in sets each containing 5 nickels and 1 dime.


Each such a group is worth  5*5 + 10 = 25 + 10 = 35 cents.


Now we can determine the number of such groups of coins.  It is

    4235%2F35 = 4200%2F35 + 35%2F35 = %282%2A4200%29%2F%282%2A35%29 + 1 = 8400%2F70 + 1 = 840%2F7 + 1 = 120 + 1 = 121.


So, there are 121 dimes and 5*121 = 605 nickels.     ANSWER

Solved mentally in 5 lines.

It is nice and instructive, isn't ?




Question 201392: Solve the inequality
4k^3-6k^3(< or =)4k
possible answers:
(-infinite,-1/2] or (0,2)
(-infinite,-1/2) or (0,2)
(-infinite,-1/2] or [0,2]
(-infinite,-1/2) or [0,2]

Found 2 solutions by greenestamps, ikleyn:
Answer by greenestamps(13327) About Me  (Show Source):
You can put this solution on YOUR website!


4k%5E3-6k%5E3%3C=4k

-2k%5E3%3C=4k

Never divide both sides of an equation -- or especially an inequality -- by an expression containing the variable. Doing so will probably, at best, lose some solutions, or it might result in totally incorrect solutions.

Collect all terms on one side of the inequality on the left with "0" on the right and find the solution set by factoring.

2k%5E3%2B4k%3E=0

2k%28k%5E2%2B2%29%3E=0

Since k%5E2%2B2 is always greater than 0,...

2k%3E=0
k%3E=0

ANSWER: [0,infinity)

None of the given answer choices is correct.

Note that the given inequality is curious, since the expression on the left contains two like terms. Since none of the given answer choices is correct for the given inequality, it is highly likely that the given inequality is not correct.


Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
Solve the inequality
4k^3-6k^3 <= 4k
possible answers:
(-infinite,-1/2] or (0,2)
(-infinite,-1/2) or (0,2)
(-infinite,-1/2] or [0,2]
(-infinite,-1/2) or [0,2]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


To this problem, I'd like to make two comments.


First comment is that the input is given incorrectly: the given inequality is INCONSISTENT with the answers list.


Second comment is that the solution by tutor @Theo is incorrect.
It contains so dangerous errors that are a mortal threat to an inexperienced and gullible reader.

For example, @Theo considers inequality

    -2k^3 <= 4k     (*)


and instructs a reader to divide it by  'k'  to get

    -2k^2 <= 4.     (**)


But inequalities  (*)  and  (**)  are not equivalent,  because if 'k' is negative,
then the inequality sign in  (**)  must be reversed.


Actually,  I do understand perfectly,  how the problem should be modified to make it consistent,
but I will not do it.

Why ? -  Because   (1)   I do not understand why I should worry about it more than the visitor,
              whose direct duty and direct responsibility is to provide a proper input,
and   (2)   because it would be too much to make corrections and then to solve the problem.

It would be a bad method to teach - the result will be a person,  who is not familiar with the notion of responsibility.




Question 1210419: 3|3-5r|=-73
Found 2 solutions by ikleyn, josgarithmetic:
Answer by ikleyn(53748) About Me  (Show Source):
You can put this solution on YOUR website!
.
3|3-5r|=-73.
~~~~~~~~~~~~~~~~~~~~~~~~~


This post is slightly defective, since it does not describe what you want from the tutors.

But if you want to ask us whether this equation has a solution, then the answer is "NO".


This equation has no solution in real numbers,
because its left side is always non-negative for all values of variable 'r',
while the right side is a constant negative number.


////////////////////////////////////

Post-solution notice

        Not only this equation has no solutions in real numbers.

        It has no solutions in complex numbers,  too,  due to the same reason.



Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
If 3-5r negative:

NO! That cannot be.
3 is positive.
abs%283-5r%29 is positive.
These two factors can not make the negative number of -73.


Question 490212: How fast is 360,000 cm/hr in m/s? Use conversion factors to cancel out one unit and introduce a new unit.
Answer by josgarithmetic(39792) About Me  (Show Source):
You can put this solution on YOUR website!
360000%28cm%2Fhr%29%28%281%2F100%29%28m%2Fcm%29%29%281%2F3600%29%28hr%2Fseconds%29

%28%2836000%29%2F%28100%2A3600%29%29%28m%2Fs%29

You can finish the computation.


Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860, 4861..4905, 4906..4950, 4951..4995, 4996..5040, 5041..5085, 5086..5130, 5131..5175, 5176..5220, 5221..5265, 5266..5310, 5311..5355, 5356..5400, 5401..5445, 5446..5490, 5491..5535, 5536..5580, 5581..5625, 5626..5670, 5671..5715, 5716..5760, 5761..5805, 5806..5850, 5851..5895, 5896..5940, 5941..5985, 5986..6030, 6031..6075, 6076..6120, 6121..6165, 6166..6210, 6211..6255, 6256..6300, 6301..6345, 6346..6390, 6391..6435, 6436..6480, 6481..6525, 6526..6570, 6571..6615, 6616..6660, 6661..6705, 6706..6750, 6751..6795, 6796..6840, 6841..6885, 6886..6930, 6931..6975, 6976..7020, 7021..7065, 7066..7110, 7111..7155, 7156..7200, 7201..7245, 7246..7290, 7291..7335, 7336..7380, 7381..7425, 7426..7470, 7471..7515, 7516..7560, 7561..7605, 7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 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17551..17595, 17596..17640, 17641..17685, 17686..17730, 17731..17775, 17776..17820, 17821..17865, 17866..17910, 17911..17955, 17956..18000, 18001..18045, 18046..18090, 18091..18135, 18136..18180, 18181..18225, 18226..18270, 18271..18315, 18316..18360, 18361..18405, 18406..18450, 18451..18495, 18496..18540, 18541..18585, 18586..18630, 18631..18675, 18676..18720, 18721..18765, 18766..18810, 18811..18855, 18856..18900, 18901..18945, 18946..18990, 18991..19035, 19036..19080, 19081..19125, 19126..19170, 19171..19215, 19216..19260, 19261..19305, 19306..19350, 19351..19395, 19396..19440, 19441..19485, 19486..19530, 19531..19575, 19576..19620, 19621..19665, 19666..19710, 19711..19755, 19756..19800, 19801..19845, 19846..19890, 19891..19935, 19936..19980, 19981..20025, 20026..20070, 20071..20115, 20116..20160, 20161..20205, 20206..20250, 20251..20295, 20296..20340, 20341..20385, 20386..20430, 20431..20475, 20476..20520, 20521..20565, 20566..20610, 20611..20655, 20656..20700, 20701..20745, 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