I need help , picture included

Abiologist is recording the loss of fish in a pond. he notes the number of fish, f, in the pond on june 1. on july 1 there were 63 fish in the pond, which is 52 fewer fish than were in the pond on june 1. which equation represents this situation? a. f – 52 = 63 b. f – 63 = 52 c. 63 – f = 52 d. f – 63 = –52

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

The radius of a sphere is 3 inches. which represents the volume of the sphere?