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Cost of a driveway |
2010-10-11 |
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From arlene:
What is the total cost of a driveway that is 25' wide and 45' long with 4" thickness if the concreat cost 92.00 per cubic yard and labor is 70.00 a cubic yard?
Answered by Stephen La Rocque. |
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Area on a dart board |
2010-10-11 |
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From Robert:
A dart board consists of concentric circles and line segment. the radius of the bull's eye is 4 inches and each ring surrounding the bull's eye is 3 inches wide.
a) what is the area of the bull's eye
b) what percent is the bull's eye.
hint there are 4 rings and the bull's eye is divided into 4 (90) degree angles (meaning 1/2 up and down) (1/2 left to right.
Answered by Stephen La Rocque. |
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Electronic cars around a circular track |
2010-10-11 |
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From Taylor:
Cory and Melissa are racing electronic cars around a circular track. They begin at the same time going in the same direction. Cory's car completes a revolution in 35 secs, while Melissa's car completes a revolution in 30 secs. How long will it take them before both cars reach the starting point again simultaneously?
Answered by Stephen La Rocque and Penny Nom. |
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What is the maximum weekly profit? |
2010-10-10 |
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From Joe:
A local artist sells her portraits at the Eaton Mall.
Each portrait sells for $20 and she sells an average of 30 per week.
In order to increase her revenue, she wants to raise her price.
But she will lose one sale for every dollar increase in price.
If expenses are $10 per portrait, what price should be set to maximize the weekly profits?
What is the maximum weekly profit?
Answered by Stephen La Rocque and Penny Nom. |
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500 feet by what equals 8 acres? |
2010-10-09 |
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From Terry:
500 feet by what equals 8 acres?
Answered by Penny Nom. |
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Un polynome de degré 3 |
2010-10-09 |
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From ait:
comment determiner n polynome P de degré 3 verifiant pour tout reel x la relation p(x+1)-p(x)=x˛
Answered by Claude Tardif. |
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Can a function be both even and one to one? |
2010-10-09 |
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From Tracy:
Can a function be both even and one to one?
Answered by Harley Weston. |
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x/200+x/400+x/600+x/800 |
2010-10-08 |
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From Ashishthombre:
step by step LCM of x/200+x/400+x/600+x/800
Answered by Penny Nom. |
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2x − 1 ( 1 − 2x) = 1 ( 2x − 2x) |
2010-10-08 |
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From MC:
Solve 2x − 1 ( 1 − 2x) = 1 ( 2x − 2x) for x
I am befuddled! Thank you for any explanation you can give that show me the steps.
I know the order in which I should tackle it, but am so confused regarding how to
assume x. Thank you!
Answered by Penny Nom. |
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Tiles on a bedroom floor |
2010-10-07 |
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From Rochelle:
John's bedroom floor is square in shape. He used 625 tiles, with a side length of 200 mm, to tile the whole floor.
Calculate the area and dimensions of the bedroom
Answered by Penny Nom. |
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Exponential form |
2010-10-06 |
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From celina:
what is the exponential form of 4x*4x
Answered by Penny Nom. |
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A division sentence for an array |
2010-10-05 |
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From Laura:
On a math test Grace needs to look at an array and write a division sentence for the array. Grace writes 18/3=6 on her answer sheet. Describe what the array on Graces test looks like.
Answered by Penny Nom. |
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Two cars |
2010-09-30 |
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From Amanda:
Two cars, 142 miles apart, start moving towards each other at the same
time. One is moving 3 times as fast as the other. If they meet 1.7 hrs
later, find the average speed of the slower car in miles per hour?
Answered by Penny Nom. |
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Rectangular arrays |
2010-09-29 |
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From Kim:
My 4th grader has started working on rectangular array that shows 2 factors of a number.
The problem reads on centimeter grid paper draw as many arrays as you can for each of the #'s 2,3,4, 5,6,7,,11,12,15 and 16. That would be great except I have no idea what they are talking about and I cannot offer any help to my daughter.
Answered by Penny Nom. |
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A Taylor polynomial for (lnx)/x |
2010-09-29 |
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From Dave:
I have a series problem that I cannot solve. The problem asks for you to compute a Taylor polynomial Tn(x) for f(x) = (lnx)/x. I calculated this poly out to T5(x) and attempted to use this to identify a pattern and create a series in order to calculate Tn(x). However, the coefficients on the numerator out to F5prime(x) are as follows: 1, -3, 11, -50, 274... Ok, so the negative is an easy fix -> (-1)^n-1. But the other coefficients are stumping me. I can't see any sort of pattern there and I've tried every trick I know. Is there another way to go about this?
Thanks!
Answered by Chris Fisher. |
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