And we're using the right edge of the subdivisions. Remember, this is a right Riemann sum. So we use the right edge, the value of the function there is just like that. And now you can see for any one of these subdivisions, our rectangles are underestimates of the area under the curve. Under, underestimate. And that's because, once again, in this particular case, the function never increases. It's either decreasing or staying flat.