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Mathematics, 14.12.2020 17:20 christinaaaat

Which of the following properties is being used in line 2? 1. (6x + 9) + 3x

2. 6x + (9 + 3x)

3. 6x + (3x + 9)

4. (6x + 3x) + 9

5. 9x + 9

A. Distributive

B. Combine like terms

C. Associative property of addition

D. Commutative property of addition

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Which of the following properties is being used in line 2? 1. (6x + 9) + 3x

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