So it would be nine pi, but this is only 1 1⁄4 of the entire circle, so we wanna divide it by four. So this right over here, we'll evaluate to nine pi over four. So part A, we get, it's equal to negative six, that's that right over there, minus nine pi, minus nine pi over four. And that's at least the first part of part A. Then they say find g prime of x. So let's find g prime of x. So g prime of x.