One. But he gets three hours credit.
Find out next time on Dragon Ball Z***
None. Who do you think broke the filament in the first place
Nothing, you can't cross a vector by a scalar. EDIT: changed multiply to cross.
Twelve. One to change the bulb and eleven to do the paperwork.
When you realize that you have had 2 strepsils within one hour.
A frog in the blender