Please do these 4 four questions

The graph of the first derivative of f (x) is shown. f' (x) Use the graph to answer the following: a) For which values of x, is f (x) increasing? [1] 3 How did you come to that conclusion? [1] 5 -4 -3 -2 -1 3 4 5 b) Find values of x (if any), such that the second derivative of f(x) is equal to zero. [1] How did you come to that conclusion? [1] c) State the x-coordinate(s) of the local extrema. [1] Justify whether they are local max or local minimum points. [1] d) How many point(s) of inflection are in f (x)? How did you come to that conclusion? [1]