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4) Suppose the price p (in dollars) and the weekly sales x (in thousands of units) or a certain commodity satisfy the demand equation 2p3+x2=14,850.

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4) Suppose the price p (in dollars) and the weekly sales x (in thousands of units) or a certain commodity satisfy the demand equation 2p3+x2=14,850. Determine the rate at which sales are changing at a time when 90,000 units are demanded, the price is $15 per unit, and the price is falling at a rate of $0.40 per week. Sales are rising at a rate of about 3,000 units per week

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