|
|
|
|
|
|
|
|
Cubic centimeters to cubic yards |
2007-11-10 |
|
Logan pose la question : if i have 188.4cm^3 of concrete how do i change it into cubic yards? Penny Nom lui répond. |
|
|
|
|
|
A trig identity |
2007-11-10 |
|
James pose la question : I need to prove trig identities, and I can't figure this one out
1 + sinx - cosx 1 - cosx
-------------------- = -------------
1 + sinx + cosx sinx
Chris Fisher lui répond. |
|
|
|
|
|
Related Rates (streetlamp and shadow) |
2007-11-09 |
|
Casey pose la question : 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? Stephen La Rocque and Penny Nom lui répond. |
|
|
|
|
|
I have 23.50 in quarters and dimes |
2007-11-09 |
|
hannah pose la question : 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? Penny Nom lui répond. |
|
|
|
|
|
Two integrals |
2007-11-09 |
|
Akilan pose la question : 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. Harley Weston lui répond. |
|
|
|
|
|
Increasing and decreasing for functions |
2007-11-09 |
|
David pose la question : 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? Harley Weston lui répond. |
|
|
|
|
|
Meters per second to miles per hour |
2007-11-08 |
|
Niecey pose la question : 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? Penny Nom lui répond. |
|
|
|
|
|
A rectangular-shaped bedroom |
2007-11-08 |
|
Svitlana pose la question : 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? Penny Nom lui répond. |
|
|
|
|
|
Distributing prize money |
2007-11-08 |
|
Barbara pose la question : 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? Penny Nom lui répond. |
|
|
|
|
|
Why is the number 1 neither prime nor composite? |
2007-11-08 |
|
amarilis pose la question : why is the number 1 neither prime nor composite? Penny Nom lui répond. |
|
|
|
|
|
Changing units and sizes of things |
2007-11-08 |
|
Carol pose la question : 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 Stephen La Rocque lui répond. |
|
|
|
|
|
Simple interest |
2007-11-08 |
|
Lee pose la question : 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 Stephen La Rocque lui répond. |
|
|
|
|
|
Two triangles |
2007-11-08 |
|
Barbara pose la question : 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) Penny Nom lui répond. |
|
|
|
|
|
Related Rates (a water trough) |
2007-11-07 |
|
Christina pose la question : 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 ? Stephen La Rocque lui répond. |
|
|
|
|
|
What number am I? |
2007-11-07 |
|
Orly pose la question : 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 Stephen La Rocque lui répond. |
|
|