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Suppose the quantity demanded weekly of the Super Titan radial tires is related to its unit price by the equation , where p is measured in dollars and x is measured in units of a thousand.How fast is the quantity demanded changing when x = 9, p = 74, and the price/tire is increasing at the rate of $2/week? Round the answer to the nearest integer.
Dropping at the rate of __________ tires/wk.
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