If I want to find the area between the graph of a function y=f(x) and between some points a and b on the x-axis, how can I do that?[br][br]One strategy is to estimate by drawing rectangles that are similar to the area I'm trying to estimate.[br][br]

1. Click on the box that says "Show Rectangles". You should see one large rectangle. Is the rectangle the same as the area you are trying to find? Is it close?[br][br]2. Use the slider to increase the number of rectangles, or n. [br][br]3. Check the box to see the area of all your rectangles added together.