- 3. (5) Consider the vector field Ğ = (2x² + yz − y)i + (y² − e² + 2)j − ((x + y)z) k and the closed box whose base is in the xy-plane with vertices at (-1, -1,0), (1, −1, 0), (1,2,0), and (-1, 2,0) and which extends in the positive z direction to a height of 6. Compute the flux of Ğ out of the box.