Not sure how to do these? "Suppose the quantity x of Super Titan radial tires...."

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Not sure how to do these? "Suppose the quantity x of Super Titan radial tires...."

The topic is centered around implicit differentiation, but the questions are really confusing to me. If anyone could lend a hand, that would be great.

Suppose the quantity x of Super Titan radial tires made available each week in the marketplace is related to the unit-selling price by the following equation where x is measured in units of a thousand and p is in dollars.p - 1/2x^2 = 48How fast is the weekly supply of Super Titan radial tires being introduced into the marketplace when x = 6, p = 66, and the price/tire is decreasing at the rate of $4/week? (Round your answer to the nearest whole number.)
 
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