Need help with practice problem!

1. Suppose S is the portion of the cylinder x2 + z2 : 9 that lies above the xy-plane and between the planes y = 4 and y = 4. In set notation: S : {(x,y,z) | x2 +22 : 9, z 2 O, 4 S y S 4}. (a) Find a vector valued function r (11,11) With appropriate restrictions on u and v that yields S. (b) Find the exact value of \"(x2 + y2 + 22) 015 . 5