posted by Anonymous .
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.
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.