1. Find the domain of the function f(x)=(4-x^2)

2. The revenue of a charter bus company depends the number of unsold seats, "s", per bus.

If the revenue, "R", in dollars, is given by R(s) = -2s^2+52s+5438, what is the maximum revenue?

3. Find an equation of the inverse of the function f(x) = (fifth root of 9-x)+4

thanks in advance!!