Consider the function f(x) = = 3 - 6x2 on the interval (-2, 5]. Find the average or mean slope of the function on this interval, i.e. f(5) f(-2) 5 - (-2) = By the Mean Value Theorem, we know there exists a c in the open interval (-2, 5) such that f'(c) is equal to this mean slope. For this problem, there is only one c that works. Find it.