Answer:
13) 1,11 14) 1,2,11,22 15) 1, 2, 4, 7, 14, 28 16) 1, 2, 4, 8, 16, 32 17) 1, 2, 3, 6, 7, 14, 21, 42
Step-by-step explanation:
18
6 - x = -12
-6 -6
-1x = -18 (-x is -1x)
-1x = -18
/-1 /-1
x = 18