The average cost (in dollars) to manufacture x dozen marking pencils is A(x) = 0.04x 3 +

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The average cost (in dollars) to manufacture x dozen marking pencils is A(x) = 0.04x3 + 0.1x2 + 0.5x + 6. Use the differential to approximate the changes in the average cost for the following changes in x.
(a) 3 to 4 

(b) 5 to 6

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