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7. For the function f(x)=4x-30x+2. (a) Find the critical numbers off (if any); (b) Find the open intervals where the function is increasing c

7. For the function f(x)=4x-30x+2. (a) Find the critical numbers off (if any); (b) Find the open intervals where the function is increasing c decreasing; and (c) Identify all relative extrema.

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