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Earn +20 ptsQ: Are polynomial expressions closed under addition?
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Are polynomial expressions closed under subtraction?
Yes they are closed under multiplication, addition, and subtraction.
Is a rational number closed under addition?
No. A number cannot be closed under addition: only a set can be closed. The set of rational numbers is closed under addition.
When are complex numbers closed under addition?
Quite simply, they are closed under addition. No "when".
Are integers closed under addition?
yes
Are rational numbers closed under division multiplication addition or subtraction?
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.
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