## Detailed description

A = x(40 - 2x) = 40x - 2x squared, parabola, y-axis marked as A, turning point at (10,200), x-intercepts at (0,0) and (20,0), y-intercept at (0,0).

A = x(40 - 2x) = 40x - 2x squared, parabola, y-axis marked as A, turning point at (10,200), x-intercepts at (0,0) and (20,0), y-intercept at (0,0).