Can you guys please help :)

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.)

Name the most appropriate metric unit for each measurement like the mass of cow

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?