No Calculator is permitted. Values are given in (). 17. Consider the function f(x)-x-x-11. a. Find the average rate of change of f(x) on [0.6]. (2 points) b. Find the instantaneous rate of change of f(x) when x=4. (2 points) c. Write an equation of the line tangent to fat the point where x = 4. (2 points) Still using f(x) above, if g(x) = f(x), find all values of x where the tangent lines to g am horizontal. Show how you arrive at your answer. (3 points)