Question

The radius of a cone-shaped tank is 4 feet less than its height. If the height of the tank is (x - 3) feet, the expression below shows the volume of the tank:

1 over 3π (x - 7)2 (x - 3)

What does the factor (x - 7)2 represent?

The square of the radius of the circular base of the tank
The square of the height of the tank
The area of the circular base of the tank
The area of the curved sides of the tank