Given the graph of y = f(x) below, answer all of the following questions.
(a) List the distinct, nonoverlapping, open intervals where f is increasing. Separate your answers with commas.
(b) List the distinct, nonoverlapping, open intervals where f is decreasing. Separate answers with commas.
it is all the intervals of which the value of the function either goes up(increases) or goes down(decreases)