A company finds that if it charges x dollars for a cell phone, it can expect to sell 1,000 – 2x phones. The company uses the function r defined by r(x) = x times (1,000 -2x) to model the expected revenue, in dollars, from selling cell phones at x dollars
each.

Use graphing technology to graph the function r. Sketch the graph here and
show the coordinates of the vertex and any intercepts.