SmolBeanPotato SmolBeanPotato 06-03-2019 Mathematics contestada Help me Please!! 7. 9a - 3b 8. (-6m + n) + (-4m - 5n) 9. (9x2 + 5) + (-2x2 - 8) + (x2 - 3) 10. 4a + (9a+3) 11. 7b + (4b - 6) 12. 8d2 + (6d2 - 4d) 13. (5x2 + 4) + (-3x2 - 4) 14. [-4x + (10 - 5x)] + 5x 15. 8 + [5 + (6 + x)]