One.
One... but, what does it matter if she will ask a man to do it !
one, but it takes 32 lightbulbs.
Nothing, you can't cross a vector by a scalar. EDIT: changed multiply to cross.
Don't know, the pope hasn't said yet. How many Lutherans does it take to screw in a light bulb? None, Lutherans don't change.
By bee-mail.