Use the graph of the derivative f of a continuous function f is shown Assume f continues to co y 4 X 2 2 X 2 y f x a On what interval s is f increasing Enter your answer using interval notation 4 On what interval s is f decreasing Enter your answer using interval notation b At what value s of x does f have a local maximum Enter your answers as a comma separated list At what value s of x does f have a local minimum Enter your answers as a comma separated list c On what interval s is f concave upward Enter your answer using interval notation On what interval s is concave downward Enter your answer using interval notation