Please helppp answer correctly

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.)

Write a corresponding real world problem to represent 2x - 125=400

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart