So this is the graph of y is equal to v of t. Now, using this graph, let's think if we can conceptualize the distance or the change in position between time a and between time b. Well, let's go back to our Riemann sums. Let's think about what an area of a very small rectangle would represent. So let's divide this into a bunch of rectangles. So I'll do fairly large rectangles so we have some space to work with. You can imagine much smaller ones. And I'm going to do a left Riemann sum here, just because we've done those a bunch.