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The​ cost, in​ dollars, of producing x belts belts is given by Upper C left parenthesis x right parenthesis equals 839 plus 14 x minus 0.078 x squared C(x)=839+14x−0.078x2. The​ revenue, in​ dollars, of producing and selling x belts belts is given by Upper R left parenthesis x right parenthesis equals 37 x Superscript two fifths R(x)=37x 2 5 . Find the rate at which average profit is changing when 484 484 belts belts have been produced and sold.

 
 Sep 21, 2017

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