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Because when you add any negative numbers, the sum will also be a negative number.

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Q: Why are all negative numbers closed under addition?
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What is closed and not-closed under addition?

The set of even numbers is closed under addition, the set of odd numbers is not.


Why are odd integers closed under multiplication but not under addition?

The numbers are not closed under addition because whole numbers, even integers, and natural numbers are closed.


Are real numbers closed under addition?

yes because real numbers are any number ever made and they can be closed under addition


Is the set of all negative numbers closed under the operation of multiplication Explain why or why not?

No. For a set to be closed with respect to an operation, the result of applying the operation to any elements of the set also must be in the set. The set of negative numbers is not closed under multiplication because, for example (-1)*(-2)=2. In that example, we multiplied two numbers that were in the set (negative numbers) and the product was not in the set (it is a positive number). On the other hand, the set of all negative numbers is closed under the operation of addition because the sum of any two negative numbers is a negatoive number.


What sets of numbers are closed under addition?

Sets of numbers that are closed under addition include the integers, rational numbers, real numbers, and complex numbers. This means that when you add any two numbers from these sets, the result will also belong to the same set. For example, adding two integers will always result in another integer. This property is fundamental in mathematics and is essential for performing operations without leaving the set.