Which property of real numbers is shown below?3 + ((-5) + 6) = (3 + (-5)) + 6

The numbers stay in the same order: 3, −5, and 6. Only the grouping changes, from (−5 + 6) to (3 + −5). Changing the grouping of addends without changing their order is the associative property of addition, so the correct choice is C, associative property of addition.

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