79. Minimum Average Cost The average cost per hour in dollars, C, of producing x riding lawn mowers can be modeled by the function 2500 T(x) = 0.3x² + 21x – 251 + (a) Use a graphing utility to graph T = T(x). (b) Determine the number of riding lawn mowers to produce in order to minimize average cost. (c) What is the minimum average cost?

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