I don’t get this side of algebra need answer

(if f(x)=4x^2 and g(x)=x+1, find (f o g)(x)

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?