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It gives closure to the set of real numbers with regard to the binary operation of addition. This makes the set a ring. The additive inverse is used, sometimes implicitly, in subtraction.
Wrong! Not only is zero a real number, but it is the additive identity for the set of integers, rational numbers as well as real numbers.
No. It has a different additive inverses for each element.
Yes.
Inverse operations. Additive inverse is not one operation but they are elements of a set.