4.) Inverses of Functions Consider the following functions: 4x + 5 f(x) = x2 - 4 g ( x) = 7 h(x) = /x - 51+2 a.) Determine which of the functions has an inverse. Find the inverse of that function. (10 points) b.) Prove that your function in part (a) is the inverse algebraically by finding f(f-(x)) and f "(f(x)). (10 points)