Question

The number x of printer cartridges that a store will sell per week and their price...

The number x of printer cartridges that a store will sell per week and their price p (in dollars) are related by the equation

x2 = 1620 − 5p2.

If the price is falling at the rate of $1 per week, find how the sales will change if the current price is $12.

Math   Calculus   
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