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The demand for a certain product is Q(x,y) = 200 − 5x2 + 13xy units per...

The demand for a certain product is Q(x,y) = 200 − 5x2 + 13xy units per month, where x is the price of the product and y is the price of a competing product. It is estimated that t months from now, the price of the product will be x(t)= 10 + 0.3t dollars per unit while the price of the competing product will be y(t) = 12.8 + 0.2t2 dollars per unit. At what rate will the demand for the product be changing with respect to time 4 months from now? (Round your answer to the nearest integer).

Math   Calculus   
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