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Use calculus to find the open intervals on which the function f (x) = x+85 - x is increasing or decreasing. If the function

Use calculus to find the open intervals on which the function f (x) = x+85 - x is increasing or decreasing. If the function is never increasing or decreasing, enter NA in the associated response area. increasing: decreasing: Show work and explain, in your own words, how you arrived at your answers. Answers with no relevant explanations may receive reduced or no credit.

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