4. The graph of the first derivative f' of a function f is shown. (Assume the function is defined only for 0 x 9.) Just write your answers from the graph. YA y= f(x) a) On what interval(s) is f increasing? b) On what interval(s) is f decreasing? c) At what value(s) of x does f have a local maximum? (Enter your answers as a comma- separated list.) x = d) At what value(s) of x does f have a local minimum? (Enter your answers as a comma- separated list.) x = e) On what interval(s) is f concave upward? (Enter your answer using interval notation.) f) On what interval(s) is f concave downward? (Enter your answer using interval notation.) g) What are the x-coordinate(s) of the inflection point of f? (Enter your answers as a comma-separated list.)x =