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Filling a container with water |
2009-04-22 |
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From frank:
With one house pipe it takes 8 hours to fill a container with water. How long will it take with 4 house pipes of the same size and the same water pressure and same container?
Answered by Robert Dawson. |
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An equivalence relation |
2009-04-22 |
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From syed:
D is the relation defined on Z as follows:
Z is an integer
For all m,n E Z, m D n if and only if 3 l (m^2 - n^2).
Find out whether the above relation satisfies to reflexive , Symmetric & transitive?
Is it an equivalence?
Answered by Robert Dawson. |
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8 golfers in 3 rounds |
2009-04-22 |
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From patrick:
We have eight people, playing three rounds of golf. Would like to know the optimal pairings so that the most people can play with everyone. Thanks.
Answered by Robert Dawson. |
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Miles per hour and feet per second |
2009-04-22 |
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From mary:
A car traveling at 60 miles per hour, how many feet per second has it traveled?
Answered by Robert Dawson. |
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15 pigs in 4 pens |
2009-04-22 |
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From Melissa:
A farmer has 15 pigs. He wants to put them all into 4 pens, have an
odd number of pigs in each pen, and have no pigs left over. Also, he
isn't thinking about having any for dinner, as they are his pets.
How does he do it?
Answered by Robert Dawson. |
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A vertical radio tower is located on the top of a hill |
2009-04-21 |
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From Rafael:
A vertical radio tower is located on the top of a hill that has an angle of elevation of 10 degrees. A 70-foot guy wire is attached to the tower 45 feet above the hill.
a. Make a drawing to illustrate the situation
b. What angle does the guy wire make with the side of the hill?
c. How far from the base of the tower is the guy wire anchored to the hill?
What confuses me about this problem is the visual situation. Isn't the angle of the guy wire with the side of the hill the same as the angle of elevation? And if not, then how is one supposed to find the other angles without any more information?
Answered by Harley Weston. |
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Percent increase from a negative number to a positive number |
2009-04-21 |
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From Brian:
I have no problem calculating year over year net profits but am having trouble when it comes to a negative.
2007 Net Profit = -110,333.00
2008 Net Profit = 66,054.00
Brian
Answered by Harley Weston. |
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A golf schedule for 18 teams |
2009-04-21 |
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From laura:
Could you help me form a golf schedule for 18 teams, playing a total of 8 weeks. Rotating the schedule each week so every team plays with a different team each week? I am using a shotgun format with 9 holes every week. Thank you for your input.
Answered by Victoria West. |
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1/(square root 16) |
2009-04-21 |
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From Conor:
Hi Guys!
I dont have a square root sign so im just gonna use the ^ symbol :)
I am just wondering if
1/(16^a)
when re-written can it be
1/16 to the power -1/2
Thanks :)
Answered by Penny Nom. |
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The center of an ellipse |
2009-04-21 |
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From Nae:
what is the ellipse center of 5x^2+3y^2=15
Answered by Stephen La Rocque. |
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Pi |
2009-04-21 |
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From Serena:
Who invented pi?
Answered by Robert Dawson and Stephen La Rocque. |
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Two regular hexagons |
2009-04-21 |
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From niko:
Two regular hexagons are ____________ similar.
Answered by Stephen La Rocque. |
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Volume of a prism |
2009-04-21 |
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From David:
The base of a rectangular prism has an area of 15.3 square inches and a volume of 185.13 cubic inches. Write an equation that can be used to find the height "h" of the prism
Answered by Robert Dawson and Stephen La Rocque. |
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A perpendicular line in standard form |
2009-04-21 |
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From Kristy:
Can you help me with this equation?
Find the equation, in standard form of the line perpendicular to 2x-3y=-5 and passing through
(3,-2) With the equation in standard form with all integer coefficient.
Answered by Stephen La Rocque. |
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The sum of the roots of a quartic |
2009-04-21 |
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From dave:
This is a algebra problem that i am confused about:
The sum of the roots of x^4-x^3+5x^2+4=0 is:
i tried graphing it, but it shows that there are no roots, but the answer is 1. are they wrong?
Answered by Penny Nom. |
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