Evaluate the surface integral of G over the surface S.
1) S is the parabolic cylinder y=2x2, 0≤x≤4 and 0≤z≤5; G(x,y,z)=5x
2) S is the cylinder y2+z2=49,z≥0 and 4≤x≤9; G(x,y,z)=z
3) S is the hemisphere x2+y2+z2=3,z≥0;G(x,y,z)=z2