I have two questions that I've been having problems with, mainly finding the bounds of x and y, if anyone could help me with that part of the problem it would be greatly appreciated, thanks

http://i39.tinypic.com/nh074p.png

for this one, since it's an average value, do the bounds have to be numbers and not functions for both x and y?

http://i43.tinypic.com/dnbj88.png