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Cubic centimeters to cubic yards |
2007-11-10 |
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From Logan:
if i have 188.4cm^3 of concrete how do i change it into cubic yards?
Answered by Penny Nom. |
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A trig identity |
2007-11-10 |
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From James:
I need to prove trig identities, and I can't figure this one out
1 + sinx - cosx 1 - cosx
-------------------- = -------------
1 + sinx + cosx sinx
Answered by Chris Fisher. |
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Related Rates (streetlamp and shadow) |
2007-11-09 |
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From Casey:
A street light is mounted at the top of a 15ft pole. A man 6ft tall walks away from the pole at a rate of 5ft per second. How fast is the tip of his shadow moving when he is 40ft from the pole?
Answered by Stephen La Rocque and Penny Nom. |
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I have 23.50 in quarters and dimes |
2007-11-09 |
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From hannah:
i have 23.50 in quarters and dimes. if i have 15 more dimes than
two times the amount of quarters i have, how many coins do i have total?
Answered by Penny Nom. |
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Two integrals |
2007-11-09 |
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From Akilan:
how to integrate these (tan x)^6(sec x)^4 and sinh(x)(cosh(x))^2.
Please send me how to do this question. Having exams on Monday. Please help.
Answered by Harley Weston. |
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Increasing and decreasing for functions |
2007-11-09 |
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From David:
Direction: Identify the open intervals on which the function is increasing or decreasing.
f(x)=1/(x^2)
f'(x)= -2/(x^3)
i understand how to get up until there, and the undf. is x=0, but now i'm having problem setting up the number table chart. i cant remember how, and where to place the increase and decrease + - the
chart, for example <---------0----------> where would the increase and the decrease be place?
Answered by Harley Weston. |
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Meters per second to miles per hour |
2007-11-08 |
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From Niecey:
If Greg was timed at 0.91 seconds for 10 meters running the 100 meter dash, at that speed, could he pass a car traveling 15 miles per hour in a school zone?
Answered by Penny Nom. |
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A rectangular-shaped bedroom |
2007-11-08 |
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From Svitlana:
Professor Reissig is doing renovations on one of the rectangular-shaped bedrooms in his house. He is putting up a border around the room. The room’s length is seven feet more than two-thirds of its width. The area of this bedroom is one hundred eighty square feet. If the border costs $1.25 per six inches, what is the minimum cost for the border?
Answered by Penny Nom. |
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Distributing prize money |
2007-11-08 |
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From Barbara:
Question from Barbara, a student:
In writing competition, the first place winner receives 1/2 of the prize money. The second runner up receives 1/4 of what the winner won.
what was the total amount of prize mone distributed if the winner receives $6,000?
Answered by Penny Nom. |
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Why is the number 1 neither prime nor composite? |
2007-11-08 |
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From amarilis:
why is the number 1 neither prime nor composite?
Answered by Penny Nom. |
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Changing units and sizes of things |
2007-11-08 |
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From Carol:
volume of cube = 216 cubic inches how do I calculate cubic feet and calculate its surface area in square feet.
a rectangular box has dimensions of 3 x 6 x 15 how do I calculate surface area in square yards and calculate volume in cubic inches. if I double the dimensions how does it affect the volume
Answered by Stephen La Rocque. |
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Simple interest |
2007-11-08 |
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From Lee:
If a bank pays 3% simple interest anually on savings, and you did not take any money out of your account, how much money would you have deposited to earn $45 in interest
Answered by Stephen La Rocque. |
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Two triangles |
2007-11-08 |
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From Barbara:
If the base of a larger triangle is 34 inches long, what is the length of side A of the smaller triangle?
(the small triangle has on top the letter a on the right side of the triangle it has the letter b, and at the bottom of the small triangle it has the number 17)
Answered by Penny Nom. |
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Related Rates (a water trough) |
2007-11-07 |
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From Christina:
A rectangular trough is 3ft long , 2ft across the top and 4 ft deep. If water flows in at the rate of 2ft^3/min, how fast is the surface rising when the water is 1 ft deep ?
Answered by Stephen La Rocque. |
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What number am I? |
2007-11-07 |
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From Orly:
what number am i? my tens digit is 2 more than my ones digit.I am less than 100.I am greater than 89.
please explain to me how. thank you
Answered by Stephen La Rocque. |
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