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The perimeter of a rectangle |
2010-11-24 |
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From shericka:
a rectangle has a perimeter of 60cm. its length is 5 times greater than its width. what is its length?
Answered by Penny Nom. |
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A remainder of 3 |
2010-11-24 |
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From khodr:
find the smallest number (>3) that , when divided by 6 , 8 , 15 , and 18 , gives a remainder of 3 .
Answered by Robert Dawson. |
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Determine if a point is inside a cube |
2010-11-24 |
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From Ali:
hi every one
i have a problem with cube
they told me to write a program that determine if a point is
inside a cube
so i need the equation of the cube to do the comparison.
in sphere it is easy
sqrt((x-xp)+(y-yp)+(z-zp))<=radios
if u please could help me
Answered by Robert Dawson. |
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How long will you and your friend be able to talk? |
2010-11-23 |
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From beket:
you and your friend leave your home town at the same time your friend travels by train 45 mph directly east while you travel by train 50 mph going directly south you are talking on cell phone but you plan charges extra if the phones are 100 miles apart. How long will you and your friend be able to talk before the charges increase?
Answered by Penny Nom. |
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Ordering mixed numbers |
2010-11-23 |
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From kate:
what are the mixed numbers 5 7/9, 5 1/2, 5 11/18. put least to greatest?
Answered by Penny Nom. |
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Two girls agree to mow a lawn |
2010-11-23 |
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From Milorad:
Two girls agree to mow a lawn 60m by 80m so that the first girl cuts one half by
cutting a uniform strip around the lawn. How wide a strip should the first girl cut?
I've been struggling with the question above, mainly with the equation and I have
set it up as 2400=(60-2x)(80-2x), if this is incorrect I would like to know where I've
gone wrong and also would like a full answer to see it properly done. I need an algebraic
answer and not one with a diagram.
Answered by Penny Nom. |
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The rate of change of (8e^3x)+(27 e^-3x) |
2010-11-23 |
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From Aleo:
I am unable to solve this problem:
Find the rate of change of (8e^3x)+(27 e^-3x), with respect to x when x= 0.5
Answered by Penny Nom. |
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The nth term |
2010-11-22 |
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From Daphne:
Question from Daphne, a student:
Hi,
My name is Daphne and I am having trouble with a math problem. I am given this pattern below and asked to find an expression for the number of Bs in the nth term of the pattern. Someone please help!!!
ABBA
AABBBAA
AAABBBBAAA
AAAABBBBBAAAA
The next part asks me to find the ratio of Bs to total letters in the nth term.
Finally it says to use my expression to determine which term has exactly 35% Bs.
Answered by Penny Nom. |
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i^i |
2010-11-21 |
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From trale:
Can we use e^ix=cosx+isinx for finding i^i like that: x= pi/2 =>
e^(ipi/2)=0+i then [e^(ipi/2)]^i=i^i.then we find i^i= 0,207879576....
is it true? can we give value for x for free?thank you.
Answered by Harley Weston. |
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What is the largest prime number? |
2010-11-20 |
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From vadali:
what is the largest prime number?
Answered by Penny Nom. |
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A product of 1 000 000 |
2010-11-19 |
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From Sharron:
There are many pairs of numbers that when multiplied together give a product of 1 000 000. However, there is one pair, and only one pair, of whole numbers that contain no zero digits and has a product of 1 000 000. What are these two numbers?
Answered by Stephen La Rocque. |
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A 35% profit |
2010-11-19 |
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From Ana:
You have a stamp collection and make a 35% profit by selling it on E-Bay for $2700. Find the original cost of the collection by using the formula:New value × 100 / 100 + percent change = Original value
Answered by Stephen La Rocque. |
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A 20" octagon |
2010-11-19 |
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From CHARLES:
I have a 20" octagon and it has 8 parts. In inches how big is each
part. I was told each part was 5.86".The top of the octagon breaks
into 3 equal parts don't equal 20".When i did my math i thought it should be 6 5/8" which is closer
to 20"
I am trying to cut a octagon out of a 20"circle
Answered by Stephen La Rocque. |
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Intersecting polygons |
2010-11-17 |
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From Laura:
How can I estimate the amount of intersection (area or better a normalized number) between two polygons if I have the cartesian coordinates of their vertices?
Thank you in advance,
regards,
Laura
Answered by Robert Dawson. |
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A scale drawing |
2010-11-17 |
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From chandler:
A parking lot 200 meters wide; 1 centimeter:25 meters, find the length on the scale drawing and the scale factor
Answered by Penny Nom. |
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