Decimals from least to greatest please help put in order. 2.2, 2.15, 2.2012, 2.501

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.)

What is the volume of this square pyramid?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?