Question 7 This question concerns the function f defined by the formula f (x) = log (1 + z?) for every number r, answer the following questions: Question 7(a) [1 point] Evaluate f' (r) for any number r. Question 7(b) [1 point] Evaluate f" (r) for any number I. Question 7(c) [3 points] Find the value or values of r for which f' (x) = 0 and draw up a table that shows the regions in which the function f is increasing and the regions in which the function f is decreasing. Question 7(d) [3 points] Find the value or values of a for which f" (r) = 0 and draw up a table that shows the regions in which the graph of f is "smiley" (concave up) and the regions in which the graph of f is "frowny" (concave down)