Hi, I need urgent help with these 3 integrals problems ... been stuck on the questions and the deadline is Friday. Thanks a lot !

1) For the green's theorem,

I got the answer :18.684. Not sure whether it is correct. Please kindly explain in steps so I know where I went wrong.

2) I'm totally unsure about finding the surface integral. How do I know the shape of the surface ?

3) and finding the curl functionf

.

All I know is, it has something to do with curl. Something like F = gradf.

Thanks again !