negetive integers are not closed under addition but positive integers are.
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addition and subtract in integers
the addition of integers is when adding negative and positive integers
Addition and multiplication are operations on integers that are commutative.
The answer depends on which binary operation you mean when you say "combining". Addition, subtraction, multiplication, division, exponentiation, etc.
The rule in dividing integers is to divide the absolute values. Two positive integers or two negative integers equals positive product. If one integer is positive and the other is negative, the product is negative.