Negative exponents work like this:

So, you have

This number is less than 1, so she will play tennis.
The equation for the volume of a cylinder is:
V = PI x r^2 x h
Using the information provided:
V = PI x 7^2 x 16
V = PI x 49 x 16
V = PI x 784
V = 2461.76 cu. ft.
The answer is A.
It's D because I don't see no solution