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Mathematics 38 Online
OpenStudy (anonymous):

WILL GIVE MEDAL!! NEED HELP ASAP!! Which sets of numbers are closed under addition? Choose all answers that are correct. A.whole numbers B.natural numbers C.negative integers D.integers

OpenStudy (anonymous):

what does this mean

OpenStudy (anonymous):

@chosenmatt @AnswerMyQuestions

OpenStudy (anonymous):

Idk

OpenStudy (anonymous):

@iGreen

OpenStudy (anonymous):

@gorv

OpenStudy (anonymous):

A set of elements is closed under an operation if, when you apply the operation to elements of the set, you always get another element of the set. For example, the whole numbers are closed under addition, because if you add two whole numbers, you always get another whole number - there is no way to get anything else. But the whole numbers are _not_ closed under subtraction, because you can subtract two whole numbers to get something that is not a whole number, e.g., 2 - 5 = -3 The integers are closed under multiplication (if you multiply two integers, you get another integer), but they are _not_ closed under division, since you can divide two integers to get a rational number that isn't an integer. The rationals, however, are closed under addition, subtraction, multiplication, and division. So the statement that 'the complex numbers are closed under addition' means that if you add two complex numbers together, you are guaranteed to get a complex number as the sum. Does this help?

OpenStudy (anonymous):

A and b

OpenStudy (chosenmatt):

integers are numbers like -1 -2 -3 -4 -5 -6 -7 -8 -9,1,2,3,4,5,6,7,8,9 whole numbers are like 12345 and so on negative integers are just -1 -2 -3 -4 -5 -6 -7 -8 -9 and so on and natural numbers are built on negative and positive numbers hyperreal numbers and and rational numbers

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