5. The graph of f(x), the derivative of f(x) is shown below: a) At what values of x does f(x) have critical points? Explain. bj On what intervals is f(x) decreasing? Explain. c) At what values of x does f(x) have a point of inflection? Explain. d) Where does f(x) have a local minimum? Explain. e) On what interval is f(x) both increasing and concave up? Explain