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Repeating decimals |
2008-03-10 |
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From Blaine:
Is it possible to put a repeating decimal number into a calculator to solve a problem?
EX: Write 39.3939... as a fraction.
Answered by Penny Nom. |
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A common chord to two circles |
2008-03-09 |
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From shubha:
please help me out with this problem.
find the length of the common chord of the intersecting circles x2+y2-4x-5=0
and x2+y2-2x+8y+9=0
Answered by Stephen La Rocque. |
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Average speed up and down a hill |
2008-03-09 |
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From Judith:
An old broken-down ar has to travel a two miles route, up and down a hill.
Because it is so old, the car travels the first mile - the ascent - at an average
speed of fifteen miles per hour. How fast must it cover the second mile -
the decent - to achieve an average speed of thirty miles per hours?
(There is a missing variable, but what is it?)
Answered by Penny Nom. |
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Saving to buy a coat |
2008-03-09 |
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From alayna:
Jackie is saving her money to buy a coat that costs $121. If she already has $61 and saves
$15 each week, in how many weeks can she buy the coat ? Make a function table to answer the
question.
Answered by Penny Nom. |
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Side lengths and area of a triangle |
2008-03-08 |
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From angela:
In the diagram of ABC the angle A is 65 the angle B is 70 and the side opposite vertex B is 7. Find the length of the side opposite vertex A and find the area of ABC
Answered by Penny Nom. |
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The volume of a countertop |
2008-03-08 |
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From Matthew:
I need to calculate volume down to cubic feet. I pour concrete countertops
and cant figure out the formula to convert inches and feet. If I have a 2.5 inch
by 2 foot by 16 foot concrete countertop how do I convert it to cubic feet
and hence know how many bags of concrete at .6 cubic feet per bag I will need.
I am trying to input the formula into a spreadsheet. thank you so much Matt
Answered by Penny Nom. |
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Logarithmique et semi logarithmique |
2008-03-08 |
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From azaar:
Je veux savoir comment passer d'un échelle linière à l'échelle logarithmique ou semi logarithmique ?
Answered by Lierre-Louis Gagnon. |
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Probability and hair |
2008-03-08 |
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From CELESTE:
MY BOSS POSED THIS QUESTION TO US. THE FIRST WITH THE CORRECT ANSWER WINS. tHANKS!
In a city of 200,000 people, no one has more than 100,000 hairs on his or her head, and no one will have fewer than 1. What are the chances that two inhabitants have exactly the same number of hairs? (Nose and ear hairs don't count.)
Answered by Penny Nom. |
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Two circles and a triangle |
2008-03-07 |
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From Adrian:
The vertices of a right-angled triangle are on a circle of radius R and the
sides of the triangle are tangent to another circle of radius r. If the lengths
of the sides about the right angle are 16 and 30, determine the value of
R+r
Answered by Penny Nom. |
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Separate three different sized marbles |
2008-03-07 |
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From Jana:
hello, I love this site, it explains everything so well. I have been asked a question in science, it asks for me to make a devise which separated three different sized marbles. I have thought this through alot but it still never makes sense to me. Everything i seem to think of never works out or has something that will make it not work. I'm really stuck on this one...please help me..! Thankyou so much Jana
Answered by Stephen La Rocque. |
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Composition of functions |
2008-03-07 |
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From sharon:
Find FoG(x)
F(x)= the square root of x-9
G(x)= x^2
and also find GoF and their domains
Answered by Penny Nom. |
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Two perpendicular lines |
2008-03-07 |
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From Daphne:
Does anyone know how to find a line perpendicular to -3x=4y=20 and
passes through the point (-12,0)?
Answered by Stephen La Rocque and Penny Nom. |
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A fence around a rectangular region |
2008-03-06 |
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From sharon:
a farmer want to make a rectangular fence he has 750 feet of material . if the width is 95 feet what is the area of the rectangle
Answered by Penny Nom. |
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Cubic feet to liters |
2008-03-06 |
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From chase:
if 1cu.ft=6.229 imp. gal and1 imp.gal=4.546 liters how many liters does of 128cuft. hold
Answered by Penny Nom. |
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Percent and range |
2008-03-06 |
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From Greg:
How do you find out the percent of a number that is with in a range of numbers (i.e. what % is 39 of range 34 to 42)?
Answered by Penny Nom. |
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