Which property of addition is shown below? 3 + 4i + 5 + 6i = 3 + 5 + 4i + 6i

The addends 4i and 5 change places: 3 + 4i + 5 + 6i becomes 3 + 5 + 4i + 6i. Switching the order of addends without changing their sum shows the commutative property of addition, so the correct choice is commutative property.

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