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# Clarification/help?

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A manufacturer of tennis balls determines that the profit from the sale of x cans of tennis balls per week measured in hundreds is given by the function P(x) = 180x - 2x2, where P is measured in dollars.  Determine the rate of change in profit when 300 cans of tennis balls are being sold.

I found the derivative of the function: P'(x) = -4x+180 And plugged in 300. Is that correct?

Julius  Feb 18, 2018
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Good work!

Yes...... that is what I would do.     \$/(can/week)  is the units   (don't forget units in your math answers.....technically, w/out units your answer is incorrect!)

ElectricPavlov  Feb 18, 2018
edited by ElectricPavlov  Feb 18, 2018
edited by ElectricPavlov  Feb 18, 2018

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