Lol my account just got banned LOL free points

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

This is so hard and it’s for a test

Determine the domain and range of the given function. the domain is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}. the range is all real numbers all real numbers greater than or equal to –2{x: x = –2, –1, 0, 1, 2}{y: y = –2, –1, 0, 1, 2}.