Click the Draw Graph button twice (don't know why it needs to be twice), after 3 seconds the graph will start drawing in relation to your mouse y value. After graph is drawn, click the Riemann Sum button to graph the left Riemann sum of the graph. Change the slider to change the width of the rectangles
For a calculus thing Using Turbo Mode makes the graph more choppy, but the Riemann sum lines will draw a lot faster
