How many different rectangular prisms can he build if he uses all the cubes

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.)

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?

How do i i solve this equation? -18 = x/3 + 3