Question 10 Consider the function f(x) = 3 x + 1 on the interval [3, 8]. 9.21 8.55 7.89 7.24 13 4 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 (3, 8) such that f' (c) is equal to this mean slope. For this problem, there is only one c that works. Find it