math
posted by zhengang .
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?

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 8foot 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 10foot walls