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Answers: 1. D. Associative Property of Addition 2. B. 7 3. D. (9 · 12) + (9 · 7) 4. A. q = –42 5. C. 6 + x = 9 6. C. y = 0 7. A. w = 3 8. B. 24 9. B. < 10. C. r = –4 11. B. y = –3 12. A. x = 48 13. C. –63 14. D. k = –131 15. B. Commutative