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richwmiller answered: 9124 problems
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Travel_Word_Problems/254214: An airplane travels 260 miles per hour into a 50 mile per hour head wind. On the return trip the wind has slowed to 25 miles per hour and the plane averages 335 miles per hour. How fast would the plane have gone with no wind on either leg?
1 solutions
Answer 186513 by richwmiller(9135)   on 2010-01-06 13:23:10 (Show Source):
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logarithm/254209: Let log(base A)^X = C , and log(base B)^X = D . Find the general statement that expresses log(base AB)^X , in terms of C and D.
My teacher says that this problem takes some people months to solve. Please help.
1 solutions
Answer 186512 by richwmiller(9135) on 2010-01-06 13:21:06 (Show Source):
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Mixture_Word_Problems/254194: Pierre bikes 7 km/h faster than Sal. They start at the same place and travel in opposite directions for 2 hours. They are then 86 km apart. How fast is Pierre traveling?
1 solutions
Answer 186509 by richwmiller(9135) on 2010-01-06 12:35:17 (Show Source):
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Pythagorean-theorem/254187: Town A is 9 miles from town B, and 12 miles from town C. A road connects towns B and C directly. Find the length of this road.
1 solutions
Answer 186508 by richwmiller(9135) on 2010-01-06 12:27:07 (Show Source):
You can put this solution on YOUR website!Is there a drawing or diagram or more information?
There is not enough info to know where town c is in relation to town A and B
they could be arranged
C A B or A B C all in a straight line or C could be i mile from A and equidistant A to B and C to B
If you are trying to say that A and B are the legs of a right triangle and c is the hypotenuse you failed.
C could be any side of the triangle.
The hypotenuse will be the longest side of a right triangle.
Very poorly worded problem. Grade of F- to whoever made this problem.
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Matrices-and-determiminant/254185: I am trying to find the total Expense.
If the expense is based on (5.77220% of total )
The 5.77220% = 3,720.97
What is the Total?
1 solutions
Answer 186502 by richwmiller(9135) on 2010-01-06 12:12:14 (Show Source):
You can put this solution on YOUR website!You almost had it
5.77220% = 3,720.97
% of what?
Let x = what
5.77220%*x = 3,720.97
where x is the total
.0577220*x = 3720.97
Think of it this way
5% of what is 5
5%*x=5 convert percent to decimal
.05*x=5
convert to fraction to see the lesson.
5/100*x=5
multiply both sides by 100
5x=500
x=100
so .05*100=5
5% of 100=5
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Square-cubic-other-roots/254191: 23^2=529-1=528/22=24-23=1
Is this right?
x
x^2
x^2 * 7
(x^2*7) -7
((x^2*7) -7) divided by 3
=x
And...
(3²)-1=8
8÷2=4
4-3=1
(x²)-(x-1)
8÷(x-1)
4-x=1
1 solutions
Answer 186498 by richwmiller(9135) on 2010-01-06 12:07:50 (Show Source):
You can put this solution on YOUR website!I see what you are trying to do but your technique is not accurate.
23^2=529-1
but 23^2 does NOT equal=529-1
23^2=529
Most certainly 23^2=529-1=528/22=24-23=1 can't be upheld
23^2 does NOT equal 1
You need to show the original problem for us to be able to follow your steps.
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Linear_Equations_And_Systems_Word_Problems/254180: Determine the slope of the tangent to y=1/1-x at the point (2,-1) without constructing a table. Explain what you are doing.
1 solutions
Answer 186490 by richwmiller(9135) on 2010-01-06 11:46:50 (Show Source):
You can put this solution on YOUR website!y=1/(1-x)
You need to get the slope of this line.
Put it in slope intercept format y=mx+b where m is the slope.
Your tangent will be a line perpendicular with a slope -1/m
All they asked for is the slope of the tangent.
Hard to believe but that is all.
You don't even have to find the equation for the tangent line.
The point (2,-1) is extra information which only serves to confuse the problem.
It would be useful for the equation of the tangent.
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Equations/254178: The area of a trapezoid is A=(a+b)h over 2. If A=300, h=5, and b=30, what is the value of a?
1. 10
2. 39
3. 90
I appreciate you guys very much. Thanks
1 solutions
Answer 186488 by richwmiller(9135) on 2010-01-06 11:33:04 (Show Source):
You can put this solution on YOUR website!Just plug in the values and calculate. You can type the problem but can't plug in the values?
We are not here to do your homework.
Show some effort on your part!
Solving this problem would take less time than typing the problem!
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Travel_Word_Problems/254179: A family wanted to get to another town by 5:00 PM. They had to travel 140 miles. The speed limit was 70 miles an hour. At what time should they leave home? Assume that they would be driving at the speed limit and there would be no traffic jams.
1 solutions
Answer 186486 by richwmiller(9135) on 2010-01-06 11:29:40 (Show Source):
You can put this solution on YOUR website!rt=d
rate *time =distance
70*t=140
solve for t
subtract t from 5:00pm
Actually you have to get from the house to the highway which can take a bit of time but math problems generally don't take in all the details such as how long it takes to get up to 70mph and how long it takes to decelerate from 70 to zero and get in and out of the car.
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Equations/249872: How to solve Y - 4X = 9
1 solutions
Answer 186483 by richwmiller(9135) on 2010-01-06 11:24:30 (Show Source):
You can put this solution on YOUR website!Carefully with forethought and patience.
You should do the same thing to both sides such as subtract add multiply or dvide
However there are two variables and only one equation. So you can't solve for both x and y but you can only solve for x in terms of y OR y in terms of x.
Are you sure you are suppose to solve it? I suspect that you are to graph it or answer questions about it such as what is the y intercept or what is the slope.
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Equations/254164: Use symbols to express the rule as the equation. Use single letters to stand for the variables. Identify what each letter represents.
e. A half-cup of unpopped popcorn is needed to make 6 cups of popped
popcorn.
.
1 solutions
Answer 186480 by richwmiller(9135) on 2010-01-06 11:16:53 (Show Source):
You can put this solution on YOUR website!e) .5u=6p
u=unpopped popcorn
p=popped popcorn
reminder: do not submit similar problems
one problem per submission
limit of 4 submissions daily
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Percentage-and-ratio-word-problems/254153: If x is 40% of y, what percent of 2y is 3x?
1 solutions
Answer 186479 by richwmiller(9135) on 2010-01-06 11:05:33 (Show Source):
You can put this solution on YOUR website!60% is correct.
Here's why.
we are told that
x=40% of y
x=.4y
What percent of y is x
"what percent of"=40%
40%*y=x
.4y=x
we are asked "what percent of 2y is 3x?"
"what percent of"=a
a*2y=3x
we write that as
3x=a*2y
where a is the percent
3x/2y=a
from the first equation we know that x=.4y
3*.4y/2y=a
y/y=1
.4/2=.2
3*.2=a
.6=a
.6=60%
a=60%
another way to solve it
x=.4y
3x=a*2y
multiply first by 3
3x=1.2*y
3x=a*2y
1.2y=a*2y
divide by y
1.2=2a
.6=a
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Linear_Equations_And_Systems_Word_Problems/254168: Suppose you are starting an office-cleaning service. You have spent $315 on equipment. To clean an office, you use $4 worth of supplies. You charge $25 per office. How many offices must you clean to break even?
1 solutions
Answer 186470 by richwmiller(9135) on 2010-01-06 10:36:31 (Show Source):
You can put this solution on YOUR website!first you need to find out what profit you make on each office cleaned.
charges - expenses=earnings
then you need to find out how many offices it will take you to earn $315
earnings *x=315
or
315/earnings=x
solve for x number offices to clean
if x is not a whole number (counting number) then raise it to the next whole number.
They won't pay you for cleaning part of an office.
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Inequalities/254167: Hello, i have a math exercise that i need the answer on, can you please help me?
the assignments are:
6x+2<38
and
2x-4>8-x
thanks :D
1 solutions
Answer 186466 by richwmiller(9135) on 2010-01-06 10:28:59 (Show Source):
You can put this solution on YOUR website!you should be more concerned with how to get the answer than the answer itself.
The answer is good for this problem only but the way to ge the answer is for many problems.
Are these inequalities meant to go together or are they two separate unrelated problems?
You also did NOT say what you want with these inequalities.
reduce? solve for x?
write another one similar?
graph them?
find the range ?
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Mixture_Word_Problems/254163: Roman mixes 12 liters of 8% acid solution with a 20% acid solution, which results in a 16% acid solution. Find the number of liters of 20% acid solution in the new mixture. Construct a table to organize the information, and show all of your work to solve the problem.
1 solutions
Answer 186465 by richwmiller(9135) on 2010-01-06 10:23:09 (Show Source):
You can put this solution on YOUR website!Roman mixes 12 liters of 8% acid solution
.08*12
with (+) a 20% acid solution
let y = amount of 20% solution
+.2*y
results (=) in a 16% acid solution.
=.16*(12+y)
total solution 12+y
Put it all together
.08*12+.2*y=.16*(12+y)
solve for y
0.96+0.2y=1.92+0.16y
y=24 liters of 20% solution
I leave the table for you.
We add a lot of stronger solution so we expect the result to be a strong solution.
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Rational-functions/254161: can yo show me how to graph the equation using the slope and y intercept:
y = 7/4x + 3
1 solutions
Answer 186463 by richwmiller(9135) on 2010-01-06 10:06:28 (Show Source):
You can put this solution on YOUR website!the slope is 7/4 which means for every 7 that y changes x changes 4
3 is the y intercept which is y when x=0
plot (0,3)
Then go up 7 for y and over 4 for x and that is your next point to plot on the graph.
You only need two points for a line(linear equation).
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Trigonometry-basics/254148: How do you solve trigionomic identies?
1 solutions
Answer 186441 by richwmiller(9135) on 2010-01-06 09:06:11 (Show Source):
You can put this solution on YOUR website!First, your question is hard to understand because you spelled most of it incorrectly.
And secondly your question is like asking how do you do math.
Be specific about which identities you want to discuss.
Identities are not problems. They are used to solve problems.
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Complex_Numbers/254138: 7
- +11
x
__________
2
- -2
3x
1 solutions
Answer 186440 by richwmiller(9135) on 2010-01-06 09:02:04 (Show Source):
You can put this solution on YOUR website!Reminder:
You are limited to one problem per submission.
No more than 4 submissions daily
No similar problems.
Try writing your problem the normal way- all on one line not in a column like first grade arithmetic.
It makes no sense the way you wrote it.
Those are not complex numbers. Complex in math doesn't mean complicated but they they have i the imaginary number sqrt(-1).
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Graphs/254140: How do you find the slop of the linear equation given here... x + y = 5
1 solutions
Answer 186430 by richwmiller(9135) on 2010-01-06 08:49:28 (Show Source):
You can put this solution on YOUR website!slop is what you feed to pigs.
I believe you mean slope ( slant)
the slope form of the linear equation is y=mx+b where m is the slope.
so put your equation in that format.
y=-x+5
m is-1
that means that it slants down from left to right
| Solved by pluggable solver: DESCRIBE a linear EQUATION: slope, intercepts, etc |
Equation  describes a sloping line. For any
equation ax+by+c = 0, slope is  .- X intercept is found by setting y to 0: ax+by=c becomes ax=c. that means that x = c/a. 5/1 = 5.
- Y intercept is found by setting x to 0: the equation becomes by=c, and therefore y = c/b. Y intercept is 5/1 = 5.
- Slope is -1/1 = -1.
- Equation in slope-intercept form: y=-1*x+5.
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Polynomials-and-rational-expressions/254053: Patricia and chelsea can build a bike together in an hour and a half. However, if Patricia worked with Tanesha they can build the same bike 10 minutes faster. Working by herself, Patricia can build a bike 2 hours faster than Tanesha.
a) How long will it take for each girl to build a bike by herself?
b) How long will it take for the three of them to build a bike together
1 solutions
Answer 186395 by richwmiller(9135) on 2010-01-05 23:52:49 (Show Source):
You can put this solution on YOUR website!I like palanisamy's work and answer but the answers don't meet the criteria
The problem states that patricia works 2 hours faster than Tanesha
palanisamy has Patricia done in less than 2 hours but tanesha takes 8 hours
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expressions/254074: Please help!
(x+y)-7 find the value of x and y
(3 to the power of 2-x) divided by u find the value of x and u
(15+y)-(y+u) find the value of y and u
1 solutions
Answer 186388 by richwmiller(9135) on 2010-01-05 22:59:41 (Show Source):
You can put this solution on YOUR website!Can't be done with the info you provided. how about some equal signs?
Also only one question per submission and only four questions per day and no similar questions
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Geometry_proofs/254080: please help me solve this proof in geometry : Given: angle 1 is congruent to angle 2, EF is congruent to CB, AF is congruent to CD,
PROVE: AB||ED
1 solutions
Answer 186385 by richwmiller(9135) on 2010-01-05 22:55:04 (Show Source):
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