Effect of Price on Demand for Tires Suppose the quantity demanded weekly of the Super Titan radial tires is related to its unit price by the equation p + x2 : 121 where p is measured in dollars and x is measured in units of a thousand. How fast is the quantity demanded weekly changing when X : 7, p : 72, and the price per tire is increasing at the rate of $2/week? (Round your answer to the nearest tire.) S X tireslweek