I need step by step details for every calculation

Use the graph off' on [7, 6] to find the following. a. Find f' (4) and f" (4). (2 points) b. At which X values does fhave a relative maximum on (-7, 0)? (4 points) 0. Find all intervals on which the graph of fis concave upward and all intervals on which the graph of f is concave downward. Explain why. (6 points) d. Find each point of inflection. (4 points)