Please help. I don’t have the best grade in math.

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

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.