Attached is a sheet with a few problems that I either can't start, or can't finish.
In question 10, I'm having trouble with parts c and d (although, if/when I get the answer to c, I think I should be able to get d). It looks a bit blurry, but the number above the integrand sign is 4 and the number below is 0, in case there's any confusion there.
In question 11, I think my main problem is I don't know the steps, or the approach, I need to take. The only thing I've done so far for this particular question is find (and I don't even know if that particular step is relevant or helpful).
As for question 12; I don't even understand the information given. Could someone please explain it in more simple terms, please?
Any help here is, of course, greatly appreciated.