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Linear_Algebra/402149: how to solve word problems that includes time and distance
1 solutions

Answer 284526 by sofiyac(695) on 2011-01-31 10:34:04 (Show Source):

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Use the formula
distance=speed*time
d=rt

Geometry_Word_Problems/402150: can you solve this equation 3x = 2x + 6
1 solutions

Answer 284525 by sofiyac(695) on 2011-01-31 10:33:08 (Show Source):

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subtract 2x from each side and you get
3x-2x=2x-2x+6
x=6

Numeric_Fractions/402164: three of the given calculator answer below or incorrect. find them
229+443+606 1273
HOW WOULD I ANWER THAT
1 solutions

Answer 284524 by sofiyac(695) on 2011-01-31 10:32:01 (Show Source):

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when you add 229, 443 and 606 you get 1278, NOT 1273.

test/402184: Qs=-2+p
Qs=8-p
1 solutions

Answer 284523 by sofiyac(695) on 2011-01-31 10:30:21 (Show Source):

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Add them together and you get
2Qs=6 divide each side by 2 and you get
Qs=3
Then plug that into either of the equations and you get
3=-2+p add 2 to each side and you get
5=p

Polynomials-and-rational-expressions/402188: I need help w/ this one...please
use rational exponents to simplify
5sqrt x^15
1 solutions

Answer 284521 by sofiyac(695) on 2011-01-31 10:28:45 (Show Source):

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+5sqrt%28x%5E15%29=5sqrt%28x%5E14%2Ax%29=5x%5E7sqrt%28x%29

When you take square root of x^14 you divide the power by two, so when you take out from radical sign you get x^7.

Polynomials-and-rational-expressions/402198: Factor completely:
20z^+100ag+125g^
please assist....algebra is so confusing..was when I was in high school..now am in college at age 44 and am lost!!
Thanks in advance,
Kathy
1 solutions

Answer 284520 by sofiyac(695) on 2011-01-31 10:25:57 (Show Source):

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I hope i copied your problem correctly, if not email me sofiyacherni@hotmail.com. You have the power signs but no powers, so i'm confused.
20z%2B100ag%2B125g=5%284z%2B25ag%2B25g%29

20z%2B100ag%2B125g=5%284z%2B25ag%2B25g%29

Use the curly brackets found next to letter P on the keyboard. Three brackets on each side would let you write problems properly, ie x%5E2

Equations/402201: Problem:
9q + 6p - 7p + q
Book answer:
-p + 10q
My answer:
10q + -p
Not going to school, so I don't know if my answer is correct or not. How would you grade it.
1 solutions

Answer 284519 by sofiyac(695) on 2011-01-31 10:21:35 (Show Source):

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Your answer is correct technically BUT
1. It's not correct to write two symbols together like + -. It would simplify to just -.
2. Normally the answer is written with letters in alphabetical order. So p comes BEFORE q, that's why the answer should be -p+10q.
:)

Polynomials-and-rational-expressions/402166: Simplify:
2^n+1 (x+3)^n
---------------------
2^n (x+3)^n-1

1 solutions

Answer 284509 by sofiyac(695) on 2011-01-31 08:40:27 (Show Source):

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Numbers_Word_Problems/401202: The price of a car is increased by 25%. The new price, after the increase is 250000. Find the following using an equation:
1)The original Price 2)The amount of the increase
1 solutions

Answer 283898 by sofiyac(695) on 2011-01-28 15:47:20 (Show Source):

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percent******number
100***********x
125**********250000
multiply across, they are ratios.
x=%28250000%2A100%2F125%29=200000

so this is the original value
Thus the amound of the increase is
increase=250000-200000=50000

Evaluation_Word_Problems/401204: We have 10 people in our group and we would like to set up a system where everyone can talk to everyone else individually for 10 minutes, how can we do this and how long would it take?
1 solutions

Answer 283896 by sofiyac(695) on 2011-01-28 15:44:27 (Show Source):

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you can set up a conference call, everyone talks for 10 minutes each 10*10=100 minutes or 1 hour and 40 minutes. You didn't specify if i talked to you and you talked to me, if that counts as once, i assume so?

Probability-and-statistics/401167: a deck of a cards is number 1 to 32, if you draw one card at random, what is the probability that the card you draw will have 5 as a factor

1 solutions

Answer 283894 by sofiyac(695) on 2011-01-28 15:42:09 (Show Source):

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So the only cards divisible by 5 are 4 5's and 4 10's, which makes a total of 8 cards. So your probability is 8 out of 32, so 8/32=1/4.
:)

Linear-equations/401200: Please teach me step by step how to solve the following equation and similar equations: (3x^2+3/4x-1)-(x^2-1/4x) Thank you very much!
1 solutions

Answer 283893 by sofiyac(695) on 2011-01-28 15:40:31 (Show Source):

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Distributive-associative-commutative-properties/401130: 7/3(12/7x)
These are fractions. Use the commutative and associative properties as needed to simplify this expression.
1 solutions

Answer 283892 by sofiyac(695) on 2011-01-28 15:38:56 (Show Source):

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Your problem is not copied properly, do you mean to say 12%2F7x

??? because that's how you wrote it. I'm assuming you mean 12x%2F7

The x on top or middle is the same thing, but it's not equivalent to the x being on the bottom. Use proper brackets so that we could see the correct problem.
%287%2F3%29%2812x%2F7%29=%2812x%2F3%29=4x

%287%2F3%29%2812x%2F7%29=%2812x%2F3%29=4x

Points-lines-and-rays/401178: m=-1 and b=-4
1 solutions

Answer 283890 by sofiyac(695) on 2011-01-28 15:34:11 (Show Source):

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You didn't post the question. We're not mind readers.
I'm thinking you need to come up with an equation in slope intercept form for a line that has a slope m=-1 and a y intercept of b=-4 (that's my best guess on what you need?????)
y=mx+b plug in your values
y=-1x-4
y=-x-4 this is would be the equation

Problems-with-consecutive-odd-even-integers/401199: The sum of three integers is 52. The second integer is 3 more than the first. The third integer is 1 more than twice the first. What are the integers?
1 solutions

Answer 283888 by sofiyac(695) on 2011-01-28 15:32:10 (Show Source):

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let the first integer be x
then the second will be x+3
then the third one will be 2x+1
Now you can add them up and make sum equal to 52
x+x+3+2x+1=52
4x+4=52
4x=48
x=12
so since we named the first one x, then the first one is 12
then the second one is 12+3=15
then the third one is 2*12+1=25
:0)

Graphs/401201: x=2y-12 what is the solution
4x-4y=-16
1 solutions

Answer 283886 by sofiyac(695) on 2011-01-28 15:27:55 (Show Source):

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x=2y-12
4x-4y=-16
First one is already solved for x, so where you see x in second equation plug in 2y-12 instead.
4(2y-12)-4y=-16
8y-48-4y=-16
4y-48=-16
4y=32
y=8
now go back up to first equation and wherever you see y plug in 8 instead.
x=2*8-12
x=16-12
x=4
So the solution is (4,8)
:)

Travel_Word_Problems/401191: If you drive 20 miles and it takes you 30 minutes, your average speed is _______.
1 solutions

Answer 283867 by sofiyac(695) on 2011-01-28 13:57:14 (Show Source):

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speed is distance/time and is usually given in miles per hour, so first we convert 30 minutes to hours, 30 minutes is half of an hour, so 0.5 hours.
so
speed=20/.5=40 miles per hour :)

Graphs/400431: Find the x-intercepts. What aré the solutions of the equation?
Y= x^2+8x+16 can you please help me with this math problem
1 solutions

Answer 283865 by sofiyac(695) on 2011-01-28 13:55:09 (Show Source):

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for x intercepts plug in y=0 and solve for x
0=x%5E2%2B8x%2B16+

x+4=0
x=-4
so you have 2 roots but they are the same
so the intercept is at x=-4

Unit_Conversion_Word_Problems/401103: Hai sir, please help me on this problem, thank you
Steve buys 20 bottles of Fizzypop. Each bottle contains 250ml. How many litres does he buy?
1 solutions

Answer 283864 by sofiyac(695) on 2011-01-28 13:44:50 (Show Source):

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20*250=5000ml now you need to convert it to liters, there are 1000 ml in 1 liter, you are going from smaller unit to bigger unit which means you divide.
5000/1000=5 liters

Exponential-and-logarithmic-functions/401119: At a wholesale food distribution center, the price of sugar
has increased 6.3% annually since 1980. Suppose sugar cost $0.43 per
pound in 1980 and this growth continues. What will a pound of sugar
cost in 2017? Use y = a(1 + r)^t and round to the nearest cent.
1 solutions

Answer 283863 by sofiyac(695) on 2011-01-28 13:42:34 (Show Source):

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First you need to convert your percent from a percent to a number so you divide it by 100 and get 0.063. Then you just plug in the numbers into the formula and evaluate.
+y+=+a%281+%2B+r%29%5Et+=+0.43%281%2B0.063%29%5E37=4.12286622=4.12

+y+=+a%281+%2B+r%29%5Et+=+0.43%281%2B0.063%29%5E37=4.12286622=4.12

Square-cubic-other-roots/401107: what is a quadratic equation for x= -4 abd x= 7
1 solutions

Answer 283862 by sofiyac(695) on 2011-01-28 13:38:47 (Show Source):

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So you kind of go backwards here. You move solutions to the other side of the equal sign because x=-4 means that x+4=0 same thing for the other one. Then you just multiply them out.
%28x%2B4%29%28x-7%29=x%5E2-3x-28

Proportions/401133: Y=mx+b
1 solutions

Answer 283860 by sofiyac(695) on 2011-01-28 13:35:56 (Show Source):

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What is your question?

Polynomials-and-rational-expressions/401162: Can someone please help?
Combine like terms. Write all answers in descending order.
12t^6-t^3+8t^6+4t^3-t^7-3t^3
1 solutions

Answer 283859 by sofiyac(695) on 2011-01-28 13:34:35 (Show Source):

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-t%5E7%2B20t%5E6

The cubed terms cancel out, so that's why you don't have any

Linear-equations/401173: Graph the equation x=Absolute valuey+3absolutevalue + 4 by plotting points.

1 solutions

Answer 283858 by sofiyac(695) on 2011-01-28 13:32:34 (Show Source):

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+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+x-7%2C+-x%2B1%29+

Plug in any points for x and evaluate y, or the other way around, be sure to use positive and negative values.

Linear-equations/401174: Graph the equation y=0.75Absolute value x-1 absolute value
1 solutions

Answer 283857 by sofiyac(695) on 2011-01-28 13:30:21 (Show Source):

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+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+0.75x-0.75%2C+-0.75x%2B0.75%29+

Numbers_Word_Problems/401175: Hai sir, pls help me on this, i got stuck on this
Find a number which is greater than one-fifth of itself by 12
1 solutions

Answer 283856 by sofiyac(695) on 2011-01-28 13:27:51 (Show Source):

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let that number be x, then in order to make an equality you would say
x%2F5%2B12=x

mulitply every term by 5 in order to get rid of the fraction
x%2B60=5x

60=4x
15=x
To check your answer: x is 15, and when you times it by 1/5 you get 3, so 15 is greater than 3 by 12 :)

Polynomials-and-rational-expressions/401177: I am having trouble here... Could someone help me? Please?
Combine like terms. Write all answers in decending order.
12t^6-t^3+8t^6+4t^3-t^7-3t^3

1 solutions

Answer 283855 by sofiyac(695) on 2011-01-28 13:23:39 (Show Source):

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+12t%5E6-t%5E3%2B8t%5E6%2B4t%5E3-t%5E7-3t%5E3

the cubed terms cancel out (add to zero)

Travel_Word_Problems/400024: A jar of nickels and dimes contains $5.45. there are 8 more dimes than nickels. how many of each are there?

1 solutions

Answer 283655 by sofiyac(695) on 2011-01-27 16:10:52 (Show Source):

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nickels x
dimes x+8
so value of nickels would be 0.05x and value of dimes would be 0.10(x+8)
then it is true that
0.05x+0.10(x+8)=5.45
0.05x+0.10x+0.80=5.45
0.15x+0.80=5.45
0.15x=4.65
x=31
so there are 31 nickels and 31+8=39 dimes

Square-cubic-other-roots/400722: Can someone help me pleas?
Rationalize the denominator
10√3/3√2
1 solutions

Answer 283652 by sofiyac(695) on 2011-01-27 16:02:42 (Show Source):

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multiply top and bottom by 3sqrt(2) and you get
%2810sqrt%283%29%2F3sqrt%282%29%29%2A%283sqrt%282%29%2F3sqrt%282%29%29

%2810sqrt%283%29%2F3sqrt%282%29%29%2A%283sqrt%282%29%2F3sqrt%282%29%29

reduce by 6
5sqrt%286%29%2F3

Equations/400725: TRANSFORM INTO AN EQUATION
the peremeter P of a square equals four times the length of a side A
1 solutions

Answer 283651 by sofiyac(695) on 2011-01-27 15:59:25 (Show Source):

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P=4A

Proofs/399970: What is the law of material implication?
1 solutions

Answer 283650 by sofiyac(695) on 2011-01-27 15:59:06 (Show Source):

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~~q v ~~s

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