Can someone please answer these for me?

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

Hello people, i have a math question that i need with, me, i will give the correct one brainiest, and for the other correct people, a and 5 stars.

Plz hurry evaluate the expression a+b where a=8 and b=19