Consider the function f(z) = 2x-3x-72x + 2 on the interval [-6, 8]. 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 (-6, 8) such that f'(c) is equal to this mean slope. For this problem, there are two values of c that work. The smaller one is and the larger one is