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Mathematics 7 Online
Pixel:

http://prntscr.com/hbfg2g

Pixel:

this set is confusing so i will do 1 at a time

Pixel:

the one i want answered will always be on top

Vocaloid:

to be "closed" under addition means you can take any real number and add them together, and the result will also be a real number

Vocaloid:

so yes, real numbers are closed under addition

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