Double 10, then divide v by the result

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 holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost

If rt is greater than ba, which statement must be true ?