Can someone please answer these questions for me please? I will name you brainliest for the correct answers.

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

Find the solution of system of equation y= x-4 y=4x+2

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