A cell phone company estimates that by charging x dollars each for a certain cell phone, they can sell 10 − x cell phones per day. Use the quadratic function R(x) = −x2 + 10x to find the revenue received when the selling price of a cell phone is x. Find the selling price that will give them the maximum revenue (in dollars), and then find the amount of the maximum revenue (in dollars).   selling price$ maximum revenue

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