Complete the statements below and identity the properly used.

1. 6(4 + 7) = 6 • ____+____•____
2. (3 + 8) • 3 = 3 • ____+____•____
3. (6 + 8) + 9 = ____+(____+____)
4. 7 • [( - 2) •5] = [____•____]•____
5. 6 ( 4 – 9) =____•____–____•____
6. 9 ( ____+ 12) = 9 • 4 + ____• 12
7. 12 + (7 + 10) = (____+____)+____
8. ____• 15 = ____ • 9
9. 8 • ____ = 1
10. 0 = 11 + _____​