Question: Find the flux of the vector field through the surface S.
1. F→ = xi→ through a square of side 3 in the plane x = -5. The square is centered on the x-axis, has sides parallel to the axes, and is oriented in the positive x-direction.
2. F→ = xk→ through the square 0 ≤ x ≤ 3, 0 ≤ y ≤ 3 in the xy-plane, with sides parallel to the axes, and oriented upward.