L 0.5/ 1 pt J 2 Delallo 1 Consider the function f(x ) = - on the interval x 5, 12 . Find the average or mean slope of the function on this interval. By the Mean Value Theorem, we know there exists a c in the open interval (5, 12) such that f'(c) is equal to this mean slope. For this problem, there is only one c that works. Find it