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The cost ,in dollars, of producing x belts is given by C(x)= 683+16x-0

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The cost ,in dollars, of producing x belts is given by C(x)= 683+16x-0.077x². Find the rate at which average cost is charging when belts have been produced.

When 256 belts have been produced, the average cost is changing at ---- for each additional belt.

(Round to four decimal places as needed. Do not include the $ symbol in your answer.)