Can someone help me?

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

Find the slope of a line given the following two points

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?