Consider U = x is a real number

A = x € U and x+2>10

B=x € U and 2x> 10

Which statement is true?

A: 5€A; 5€B

B: 6€A; 6€B

C: 8€A; 8€B

D: 9€A; 9€B

What property is (a+b) + c=a + (b+c)

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