tolong kerjakan no 15,16,17,18,19,20

16. 117 ÷ 3 = 39
37,39,41
ke-2 = 39
17. 3x > -21
x > -7
18. 2y-8 < 14
2y < 14 + 8
2y < 22
y < 11
19. 5p-4 >= 7p-12
5p-7p >= -12+4
-2p >= -8
p <= 4
20. 2(2n-1) <= 3(2n+4)
4n-2 <= 6n + 12
4n-6n <= 12 + 2
-2n >= 14
n >= -7