And let's go all the way to y is equal to 3. y is equal to 3 right over here. So from y equals negative 1 to y equals 3. So y equals negative 1 to y is equal to 3. And that's going to give us the volume of our upside down gum drop type looking thing. So the key here is, so that we can start evaluating the double integral, is to just figure out what the area of each of these disks are as a function of y. And we know that area is a function of y. It's just going to be pi times radius as a function of y squared.