Posted by **zhengang** on Wednesday, February 29, 2012 at 3:13pm.

A trough is 11 feet long and has ends that are isosceles triangles that are 1 foot high and 2 feet wide. If the trough is being filled at a rate of 9 cubic feet per minute, how fast is the height of the water increaseing when the height is 7 inches?

- math -
**Anonymous**, Tuesday, March 22, 2016 at 6:21pm
The amount of paint needed to cover the walls of a room varies jointly as the perimeter of the

room and the height of the wall. If a room with a perimeter of 65 feet and 8-foot walls requires

5.2 quarts of paint, find the amount of paint needed to cover the walls of a room with a

perimeter of 80 feet and 10-foot walls

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