This exercise is based on the following functions. f(x) = x2 + 4 with domain (-co, +0o) g(x) = x - 4 with domain (-co, +0o) h(x) = x + 5 with domain [40, +co) u(x) = Vx + 40 with domain [-40, 0) v(x) = V 40 - x with domain [0, 40] (a) Write a formula for the indicated function. s =f+g S ( X) = (b) Give the domain. (Enter your answer using interval notation.) (c) Specify the function's value at the given point a = -5, if defined. (If an answer is undefined, enter UNDEFINED. s(-5) ....... EX Enter an exact number