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The power set of A |
2012-03-24 |
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From rashdin:
Can you find a set A, |A|=4 and define a bijective function between A and P(A)?
Answered by Penny Nom. |
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Angle measures |
2012-03-21 |
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From jogiboy:
how can i get the sine theta if the given is 3.14/3
Answered by Penny Nom. |
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How long will it take lee to catch up with jodie? |
2012-03-21 |
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From kirsten:
for example, if jodie is on the bus travelling at 10 m.p.h and lee is walking at 4 m.p.h how long will it take lee to catch up with jodie?? what is this mathematical name for this
Answered by Harley Weston. |
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A steamroller with a 3 foot diameter and a 6 foot width makes 20 revolutions |
2012-03-21 |
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From Robert:
A steamroller with a 3 foot diameter and a 6 foot width makes 20 revolutions. How much ground area does it pave?
Answered by Penny Nom. |
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Gravel, sand, cement and an equilateral triangle |
2012-03-21 |
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From saheed:
how many tonnes of gravel and sand,bags of cements will be required to concrete 5feet depth/deep of 4feet equilateral triangle?
Answered by Harley Weston. |
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Two overlapping circles |
2012-03-21 |
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From Monty:
If you have a 3.75" radius circle overlapping a 5" radius circle with their centers 3" apart what would be the area of the non-overlapped portion of the small circle?
Answered by Penny Nom. |
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The area of an irregular hexagon |
2012-03-20 |
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From Jacob:
I am having trouble finding the area of an irregular hexagon with 5 right angles.
It has 5 given sides, with the lengths as follows:
8.2 ft.
6 ft.
4.5 ft.
2.2 ft.
6 and one third ft.
Answered by Chris Fisher. |
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Remainders |
2012-03-18 |
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From Leslie:
Question: Janice has some marbles. When she divides them into groups of 4, she has 2 marbles left over. If she divides them into groups of 5, she will also have 2 left over. What is the least number of marbles she can have?
Answered by Penny Nom. |
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The length is inversely proportional to the width |
2012-03-18 |
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From David:
For a given set of rectangles, the length is inversely proportional to the width. In one of these rectangles, the length is12 and the width is 6. For this set of rectangles, calculate the width of a rectangle whose length is 9
Answered by Penny Nom. |
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The price per square inch of a pizza |
2012-03-17 |
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From jordan:
pizzaz pizza sells a small pizza for $10.99.it has a diameter 10 inches.what is th price per square inch ?
Answered by Penny Nom. |
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Square numbers |
2012-03-17 |
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From david:
How many square numbers are there between 0 to 100?
Answered by Penny Nom. |
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A vertical line passing through (10,4) |
2012-03-16 |
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From Isabelle:
Hi! My question is this:
Write the equation of each line described:
A vertical line passing through (10,4)
I would really appreciate your help!
Thanks,
Isabelle
Answered by Penny Nom. |
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Forming a triangle from 3 line segments |
2012-03-15 |
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From rustom:
A point X is selected at random from a line segment AB with midpoint 0. Find the probability that the line segments AX, XB, and A0 can form a triangle.
Answered by Penny Nom. |
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Probability |
2012-03-14 |
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From tom:
Let A and B be events with p(A ∪ B)= 7/8, p(A ∩ B)= 1/4, p(A' )= 5/8
Find:
a. p(A)
b. p(B)
c. P(A ∩ B')
...problem for me is that if p(A') = 5/8 then P(A) should be 1/4...so that the p(A' ∪ A) = p(A ∪ B) = 7/8...however, the book says the answer for p(A) is 3/8...does that mean, my interpretation is wrong (because if it is, then all my answers would be crap)...or is it just another typographical error?
Answered by Penny Nom. |
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An increase/decrease in profit |
2012-03-13 |
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From Thanikasalam:
It is understood that increase/decrease in profit for current year compared to the previous year is done by the formula (x-y)/y, with x=profit on current year and y=profit on previous year. How do we derive this formula?
If we work on this formula of calculating increase/decrease in profit, we get x/y-1
* = (x-y)/y
= x/y - y/y
= x/y - 1
How do you justify the 1 in the equation above. How to derive the formula and how do i prove it?
Answered by Penny Nom. |
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