Mathematics, 02.09.2021 04:40 kadrian12

Which rule do i use. H E L P 1.The statement x+y=y+x is true based on which axiom for addition?
2.(qr)t=q(rt) follows which axiom for multiplication?
3.The statement x⋅1=x is true based on which axiom for multiplication?
4.The statement x+y∈R is true based on which axiom for addition?

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Which rule do i use. H E L P 1.The statement x+y=y+x is true based on which axiom for addition?