Knowledge/Understanding [10 marks]. Marks per question are indicated in brackets [ ]. 1. A function fis given by its graph. Find the intervals of increase/decrease. [2 marks] 2- 2. The following graph represents the derivative function f of the function f. a) Find the intervals of increase/ decrease of the function. [2 marks] b) On which intervals is the graph of the function f(x) concave up, and on which intervals is the graph concave down? [2 marks] 23. The following graph represents the second derivative f"(x) of the function f(x). On which interval is the graph of the function f(x) concave up, and on which interval is the graph concave down? [2 marks]