please help solve 31 and 32

Name: Fall Final Exam AB Calculus 81. The second derivative of a function f is given by S"(x) = x (x-3) (x -10) At which of the following values of X does the graph of f have a point of inflection? (A)3 only (B) 0 and 3 only (C) 3 and 10 only (D) 0, 3, and 10 Graph of f' 32. The function of f is continuous on the closed interval [0,5]. The graph of S' , the derivative of f, is shown above. On which of the following intervals is f increasing and concave down? (A) [0,2] and [4,5] only (B) [2,4] only (C) [0,1] and [3,4] only (D) [1,2] only