calculus help please
posted by philip .
At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 9 pi or 28.27433388 cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant?

A hollow cone has height 5 feet and base diameter 4 feet. The vertex of the cone is pointed down so that it can serve as a container. Water is poured into the cone at the rate 3/2 cubic feet per second. At what rate (in feet per second) is the depth of the water increasing when the depth of the water is 3 feet?

a piece of fabric for a quilt design is in the shape of parallelogram. The base is 5 inches and the height is 3.8 in. What is the total area of the 22 paraellelogram pieces needed for the quilt What are the units