Hi, am kinda having trouble figuring out the following problem? any help would be highly appreciated...

Evaluate https://instruct.math.lsa.umich.edu/...065cf6e281.png if https://instruct.math.lsa.umich.edu/...6ca1487d11.png and the surfaceSis given by https://instruct.math.lsa.umich.edu/...28992df681.png for https://instruct.math.lsa.umich.edu/...c5e73b3ff1.png. (TakeSto have upward orientation.)

https://instruct.math.lsa.umich.edu/...fa146897a1.png