11. 3b +2<56-6≤2b+9
13. 10m - 7< 17m or -6m > 36
15. m+ 3 ≥ 5 and m+ 3 < 7
12. -2a+3 ≥ 6a-1>3a-10
14. 5n -1 < -16 or-3n-1<8
16. y - 5 <-4 or y-5≥1