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Spider Industries is a U.S.-based company that test-marketed an electronic cobweb destroyer in Japan. The company's revenue, R, is a function of the number of destroyers sold, x, using the following formula R = 160x -0.2x^2.

If the company sold their destroyers for $180 each, what is the maximum revenue Spider Industries could bring in?

I thought it was $32,000 but that was incorrect.

  • precal -

    Well, the equation is a parabola.The roots are x=0 and x=800 check that.

    So the maximum must be at x=400

    = you do it.

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