Using Stoke's Theorem, evaluate:∫∫ (∇⋅V)⋅ dA

over any surface whose bounding curve is the (x,y) plane, whereV = (x - x^{2}z)î + (yz^{3}- y^{2})jˆ + (x^{2}- xz)ˆk

I'm really stuck on this particular problem, so any and all help is much appreciated. Thank you!