The 1954 Statelessness Status Convention provided a definition of a stateless person (which has since become part of customary international law, according to the International Law Commission), and sets out a number of rights that stateless persons should enjoy.
The ratio of two integers P and Q can be expressed as P : Q or P/Q. In both cases, you may divided P and Q by their greatest common factor so as to express the ratio in its simplest form.
Let's try one with a negative second number. In the example -4 + (-2) = , start on the number line at -4 and since (-2) is negative, move to the left 2 spaces! (-4) + (-2) = (-6). Remember, subtraction and addition are just opposite operations. So to subtract integers, just add the opposite of the second number.