this homework correspond to Line and surface integrals.

1) Determine the parametric representation of the curve corresponding to the intersection of the spherex2+y2+z2=16 with the plane y+z=4.

2) calculate C(3x2+3y2)dS, if C is the intersection of the spherex2+y2+z2=4 with the plane z=0.

3) Let S:x2+y2+z2=1 , calculateS(xy+yz+xz)dS.

Please I need all the development of each exercise, with clear letters