I need help with this thanks

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

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Select all of the quadrants that the parabola whose equation is y=√x-4 (principal square root) occupies. i ii iii iv