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Proportionality |
2009-11-03 |
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From Nazrul:
If x is proportional to y , how can I prove that (x^2-y^2) is proportional to xy.
Please explain the process.
Answered by Penny Nom. |
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The roots of a polynomial |
2009-11-03 |
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From Jess:
Find the value of a positive integer k such that f(x)=x^2 - 2kx + 55 has roots at k +3 and k - 3.
Answered by Penny Nom. |
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A single die is rolled twice |
2009-11-03 |
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From Michelle:
A single die is rolled twice. Find the probability of getting two numbers whose sum exceeds 5.
I can't seem to come up with any of these answers, Help. A. 0.72 B. 0.89 C. 0.68 D. 0.58
Answered by Penny Nom. |
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A number puzzle |
2009-11-03 |
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From Jacqui:
Write a number sentence. Use every digit once, 7, 4, 3, 6, 5,10. Insert math symbols +, - , *,/ and end up with the number 3. Use parentheses if necessary.
Jacqui
Answered by Claude Tardif and Penny Nom. |
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What's the next term? |
2009-11-03 |
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From bharat:
if
1=5
2=25
3=325
4=4325
5=?
Answered by Robert Dawson and Penny Nom. |
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The extended real numbers |
2009-11-02 |
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From Justin:
Hello there, I was wondering is the set of extended real numbers a closed set or an open set?
Justin
Answered by Robert Dawson. |
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Guess and check |
2009-11-01 |
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From Laura:
There is a game at the fair in which you toss
balls into bowls to win fish. There are 52
bowls. The larger bows contain five fish, and
the smaller ones contain three fish. If there are
202 fish total, how many bowls of each size are
there?
Laura
Answered by Penny Nom. |
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A lottery question |
2009-11-01 |
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From munirah:
assume the chances of winning the lottery are 1 in 1000.how many times would you have to play to attain 0.5 probability of winning at least once?
Answered by Robert Dawson and Claude Tardif. |
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At what rate are the people moving apart? |
2009-11-01 |
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From saira:
A man starts walking north at 4 ft/s from a point P. 5 minutes later a woman starts walking south at 5 ft/s from a point 500 ft due east of P. At what rate are the people moving apart 15 minute after the woman starts walking ?
Answered by Harley Weston. |
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Consecutive positive integers |
2009-11-01 |
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From Madi:
I'm doing my homework, and there are questions on Consecutive Positive Integers. I was just wondering, what is a consecutive integer?
Or to be more specific, what is a consecutive POSITIVE integer?
Answered by Penny Nom. |
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Sarah's age |
2009-10-31 |
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From Kenneth:
2/3 of Mary’s age equals Sarah’s age and 3/4 of Ruth’s age equals Sarah’s age.
If the total ages equal 46, how old is each girl?
Answered by Claude Tardif. |
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A path around a pond |
2009-10-31 |
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From adeniji:
find the area of a concrete path 2m wide surrounding a circular pond 12m in diameter
Answered by Penny Nom. |
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Where is the Father? |
2009-10-30 |
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From Jeffrey:
A mother is 21 years older than her kid and within 6 years the child
will be 5 times younger than the mother. Where is the Father?
Jeffrey
Answered by Robert Dawson and Claude Tardif. |
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Rationals |
2009-10-30 |
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From Jawsh:
I don't quite understand the whole idea of rationals.
If you have 3Squareroot 49. Is that equal to 3Squareroot 7^2?
Can you break it down with an example for me please.
Answered by Robert Dawson. |
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The intersection of two graphs |
2009-10-30 |
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From asma:
by using the suitable scales,draw both the graph of x/2 + y/4 =3 and y=2 on the same graph paper.Find the points of intersection of the two graph.
Answered by Penny Nom. |
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