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Earn +20 ptsQ: Which set of numbers is not closed under subraction?
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Are the set of rational numbers closed under addition?
Yes, the set is closed.
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.
Is this set of negative numbers closed under multiplication or addition?
Yes. The empty set is closed under the two operations.
What is a set of rational numbers not closed under?
It is not closed under taking square (or other even) roots.
What is the set of whole numbers closed by?
If you mean the set of non-negative integers ("whole numbers" is a bit ambiguous in this sense), it is closed under addition and multiplication. If you mean "integers", the set is closed under addition, subtraction, multiplication.
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