Ithink d is the right answer - can someone ? !

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.)

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?