The next few problems are all Mean Value Theorem related, but instead of finding the point that witnesses the mean slope you are finding the endpoint already knowing what the mean is. 15 If f(x) = x2 - 1 and a = 2 is the point guaranteed to exist by the Mean Value Theorem on the interval [0, b] what is b? 16 If f(x) = 3x2 - 3x + 1 and a = is the point guaranteed to exist by the Mean Value Theorem on the interval [1, b] what is b? 17 If f(x) = _ and x = 5 is the point guaranteed to exist by the Mean Value Theorem on the interval [1, b] what is b? 18 If f(x) = vr and I = 4 is the point guaranteed to exist by the Mean Value Theorem on the interval [1, b] what is b