Because when one rational number is subtracted from another rational number the result is a rational number.
Don't forget that integers (ℤ) are a subset of rational numbers (ℚ).
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Rational numbers are closed under addition, subtraction, multiplication. They are not closed under division, since you can't divide by zero. However, rational numbers excluding the zero are closed under division.
Yes. The rational numbers are a closed set with respect to subtraction.
No, there is not.
Subtraction is not commutative nor associative.
No.