4. Use the graph of the function below. 100- d 60 40 20 a 12 -20 C -40- f -60 -80 b -100 -120- a. Fill out the table using only the following: + , 0 a b C d e f 8 f (x ) f' (x ) f " ( xx ) b. What points (a, b, c, etc.) on the graph are inflection points? c. If the equation of the function graphed is f (x) = x*+x -24x2 -4x+80, find the coordinates of the inflection points correct to three decimal places