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Use calculus to nd the open Intervals on which the function f (1:) = a: + 10121 7 a: is increasing or decreasing, If the function is never increasing or decreasing, enter NA in the associated response area. increasing: 3 "D decreasing: B T\" Please explain, in your own words and in a few sentences, how you arrived at your answers. Answers with no relevant explanations may receive reduced or no credit