Consider the function f(x) = 5x + 9x. For this function there are four important open intervals: ( − ∞, A), (A, B), (B, C), and (C, ∞0) where A, and C are the critical numbers and the function is not defined at B. Find A and B and C For each of the following open intervals, tell whether f(x) is increasing (type in INC) or decreasing (type in DEC). (-∞, A): (A, B): (B, C): (C, ∞0):

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