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A point on a graph |
2008-07-08 |
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From Rita:
If (2, b) is a point on the graph of y = (x^2) + 4x, find the value of b.
Answered by Leeanne Boehm. |
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Pounds per cubic foot |
2008-07-08 |
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From Peter:
A column has a diameter of 42 feet, a height of 40 feet, and weighs 15 tons. What is the mean number of pounds per cubic foot?
Answered by Penny Nom. |
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Neither prime nor composite |
2008-07-08 |
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From saloni:
Give the counting number which is neither prime nor composite ?
Answered by Penny Nom. |
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Zip codes, postal codes and 5 digit codes |
2008-07-08 |
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From Mike:
Sorry if you have answered this before but I don't understand the explanations I have seen.
How many possible combinations are in a 5 digit code (like a Zip Code). Is there an equation that can be used for this type of question?
Answered by Penny Nom. |
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Domain and range |
2008-07-07 |
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From marylie:
what is the domain and range of f(x)= -sq.rootof x ^2-4??tnx
Answered by Harley Weston. |
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Two trains |
2008-07-07 |
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From Elisha:
Trains at each end of the 50. km long Eurotunnel under the English Channel start at the same time into the tunnel. Find their speeds if the train from France travels 8. km/h faster than the train from England and they pass in 17 minutes.
Answered by Janice Cotcher and Penny Nom. |
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Probability and two digit numbers |
2008-07-07 |
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From Peter:
What is the probability that if you multiply two randomly selected two digit whole numbers, the result is greater that 100 and less than 200. Express your answer as a common fraction.
Answered by Janice Cotcher. |
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A net profit of 4% on a sales volume of $100 million |
2008-07-07 |
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From Muriel:
If a firm has a net profit of 4% on a sales volume of $100 million and the
company has instituted logistics programs that result in cost savings of
$1 million, what equivalent sales increase would be required to equal such
a cost savings?
What I do know is that the net profit % has increased from 4% to 5% and
the profit has gone from $4,000,000 to $5,000,000 but I have no idea what
the formula is to figure out how much sales would have to increase to
result in that same profit.
Answered by Janice Cotcher. |
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A boat travels 20 kms upstream in 6 hrs ... |
2008-07-07 |
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From vidya:
A boat travels 20 kms upstream in 6 hrs and 18 kms downstream in 4 hrs. Find the speed of the boat in still water and the speed of the water current?
Answered by Penny Nom. |
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CIRCLES |
2008-07-07 |
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From daryl:
Find the equation of the smaller circle that is tangent to the axes and the circle x(squared)+y(squared)=2x+2y-1?
Answered by Penny. |
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Cubic centimeters and milliliters |
2008-07-07 |
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From Robert:
how many milliliters are in 750 cubic centimeters?
Answered by Harley Weston. |
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Would you please recommend a book |
2008-07-05 |
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From Calvin:
I never enjoyed and understood the point in doing maths at high school.
At college I studied Engineering and the mathematics was never covered
to the level that I wanted. I want to study and fully understand and master
mathematics by myself, and hence I would like a recommendation on
which mathematics book I should bye. I want to understand and master
every concept from logic,reasoning,axioms to algebra,calculus up to and
including the latest mathematical fields and concepts.
So would you please recommend a book or books which may help me.
Answered by Claude Tardif. |
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Choosing a number from 1 - 400 |
2008-07-04 |
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From Peter:
The numbers 1-400, inclusive, are put into a hat. What is the probability that the first number chosen at random is a multiple of 4 or 17? Express your answer as a common fraction.
How do you do this the question without a calculator?
Answered by Leeanne Boehm. |
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Divisibility by 11 |
2008-07-04 |
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From Peter:
For what single digit value of n is the number n53nn672 divisible by 11?
Answered by Leeanne Boehm. |
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Probability of Matching Socks |
2008-07-04 |
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From Peter:
Rick has 6 different pairs of socks. Whats the probability that two randomly selected socks will be from a matching pair?
Answered by Leeanne. |
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