Please help me on this question please ASAP

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.)

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c