Which equation shows an example of the associative property of addition?

The associative property of addition changes the grouping of addends without changing their order: (a + b) + c = a + (b + c). Choice A has exactly this form: (–7 + i) + 7i = –7 + (i + 7i). Choice B changes the order of the terms, so it illustrates the commutative property instead.

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