What does three plus the definite integral from one to five of R of T DT equals 19 mean? And we have some choices, so like always, pause the video and see if you can work through it. All right, now let's work through this together. So they tell us that she made $3,000 in the first month, and we also see this three here, so that's interesting. Maybe they represent the same thing, we don't know for sure yet. But let's look at this definite integral. The definite integral from one to five of R of T DT.