What do you think this thing right over here is going to be equal to? What does this represent? What does this equal to? And I encourage you to pause the video and try to think about it. Well, if you try to visualize it, you're thinking, okay, the area under the curve f of x above the x-axis from x equals c to x equals c. So this region, I guess we could call it, that we think about it, does have a height. The height here is f of c. But what's the width? Well, there is no width.