I have no clue why my answers are not working. Can someone help?

X zy zy ) 9 8 1 6 5 3 D G B ETF 3 3 4 1 1 1 9515 w G W G * + X -> C testdrive.cas.ou.edu/webwork2/1914_Taylor_FA21/3.3/12/ Apps YouTube String (Java SE 14 &... TD Advanced Stock Or... The ultimate guide... TD Basic Stock Order T... fx Position Size Calcul.. TD What is Leverage in... Reading list Problem 8 v Problem 9 (1 point) Use the given graph of the function f to answer the following questions. Problem 10 Problem 11 v Problem 12 Problem 13 Problem 14 Problem 15 Problem 16 Problem 18 Problem 19 Problem 20 Problem 21 Problem 22 1. Find the open interval(s) on which f is concave upward. Answer (in interval notation): (0, 2) U (5, 8) 2. Find the open interval(s) on which f is concave downward. Answer (in interval notation): (2, 4)U(4, 5) 3. Find the coordinates of the points of inflection. List your answers as points in the form (a, b). Answer (separate by commas): (2,2), (5, 3) Note: You can click on the graph to enlarge the image