Second rectangle here, it has a height of, we look at our right endpoint, one squared plus one is two times our width of one. Well, that's just gonna give us two. And then here, our right endpoint is two squared plus one is five times our width of one gives us five. So in this case, we get, when we look at our right endpoints of our intervals, we get one plus two plus five is equal to eight. And eyeballing this, it looks like we're definitely over-counting more than under-counting. And so this looks like an over-approximation. So the whole idea here is just to appreciate how we can compute these approximations using rectangles.