I need help with this please!!

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.)

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

The triangles are similar. what is the value of x? show your work.