Effect of Price on Supply of Tires 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. =48 How fast is the weekly supply of Super Titan radial tires being introduced into the marketplace when x = 9, p = 88.5, and the price/tire is decreasing at the rate of $2/week? (Round your answer to the nearest whole number.)