Difference of squares gives which complex factors for the expression x^2+13.

What is life ? a: hell b: gods bible c: or depression

Why do you think electric energy for households is generally supplied by power plants instead of by an electric generator at home.

An item not normally included in ansi recommendations, but recommended by other groups is: a) a syringe b) a blood pressure monitor c) a defibrillator d) all of the above