None, because they can't change anything.
None. The sockets all went with the house.
Two. One to screw it in and one to film it. One, but it takes him fifty tries.
One to hold the lightbulb, and the rest of the world to revolve around them
Two! But don't ask me how they got inside there.
Nothing, you can't cross a vector by a scalar. EDIT: changed multiply to cross.
Sorry, they can only change the floor essence.