Mathematics, 27.08.2019 11:30, tinsey

Which equations support the fact that rational numbers are closed under addition?
select each correct answer.
9√+9√=29√9+9=29
13+13=2313+13=23
6√+(−6√)=06+(−6)=0
2√+2√=22√

Answers: 2

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Which equations support the fact that rational numbers are closed under addition?
select each...