Refer to the graph of the function f on the interval (0, 12) shown in the following figure. 6+ 5- 4 3+ 2- 1 1 4 6. 8. 9 10 11 12 (a) Find the critical numbers of the function. (Enter your answers as a comma-separated list. If an answer does not exist, ente DNE.) X = (b) Find the interval(s) where the function is increasing and the interval(s) where it is decreasing. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) Increasing: Decreasing: (c) Find the relative maxima and relative minima, if any, of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) Relative maximum value(s): Relative minimum value(s):

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