Question: Let f be the function defined by f(x)=k+12x+3x 2x wherek is a constant. a. On what interval is the function increasing? Justify your answer.

Let f be the function defined by f(x)=k+12x+3x 2x wherek is a constant. a. On what interval is the function increasing? Justify your answer. b. If the relative maximum value of is 4, what is the value of k ? c. Find the interval where the function is concave up. Justify your answer. d. Find the relative minimum of the function.

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