I'm struggling to see where you have obtained these values in the integral, i started the question by implementing the divergence theorem of Gauss but i wasn't sure if that was the way to go about it, so then started trying to find an answer using double integrals of volume. So because i don't know the methd, i certainly don't know where to start with plugging in values, even where they've come from!
No.
I did it because I'm blind and misread the question and gave you the answer to a harder one ..... (On the bright side, you'll probably have to answer a question like that sooner or later - I just brought it up sooner).
And for all worried members - my eyesight has returned (it's a miracle!)