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] 2