The graph of a company's marginal profit P'(t) at month t is shown over the interval [0, 42] a. On what open interval(s) is the profit P(t) increasing? b. On what open interval(s) is the profit P(t) decreasing? 0- 28 42 a. List the interval(s) on which P(t) is increasing. (Type your answer in interval notation. Use a comma to separate answers as needed.)

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