A company finds that if it charges x dollars for a cell phone, it can expect to sell 1000 − 2 1000−2x phones. The company uses the function r​ defined by ( ) = ( 1000 − 2 ) r(x)=x(1000−2x)​ to model the expected revenue, in dollars, from selling cell phones at x​ dollars each. Use your graphing calculator to graph the function r​, then answer the questions below.​ a) What do the x​-intercepts mean in this situation? Press Shift Tab to return to the editor or Tab to move away. ​ b) Is 0 ≤ ≤ 600 0≤x≤600​ an appropriate domain for the function r​? Explain your reasoning. Press Shift Tab to return to the editor or Tab to move away. ​ c) At what price should the company sell their phones to get the maximum revenue? Explain your reasoning.