How do you know if the function on a table is exponential or linear

What is the inverse of the function f(x)=4x+8

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

3women sell hats at a craft fair weekly. the money they make at the fair is split into categories. 9% goes to pay taxes. $55 goes to pay rent for the space they sell in. the rest is split between the women. if the group make $706 at the fair, how much does each women get paid once the money is divided