Does anyone know I need help on this?!!

At a sand and gravel plant, sand is falling off a conveyor and onto a conical pile at a rate of 16 cubic feet per minute. the diameter of the base of the cone is approximately three times the altitude. at what rate is the height of the pile changing when the pile is 12 feet high? (hint: the formula for the volume of a cone is v = 1 3 πr2h.)

Askate shop rents roller skates as shown on the table below. which graph and function models this situation?

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder