please assist

Consider the function fix} = ti + l. on the interval [4, 'F]. Find the average or mean slope of the function on this interval. :] Round your answer to four decimal places as needed. By the Mean lI'lalue Theorem, we know there exists a c in the open interval (4, 7] such that f (c) is equal to this mean slope. For this problem, there is only one I: that works. Find it. :] Round your answer to four decimal places as needed