How do I solve this proportion?

Acable car begins its trip by moving up a hill. as it moves up, it gains elevation at a constant rate of 50 feet/minute until it reaches the peak at 2,000 feet. then, as the car moves down to the hill’s base, its elevation drops at the same rate.

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

Franco wants to double the volume of the cone. what should he do?