Answer:
16.
6= 6, 12,18,24
12= 12,24
GCF=12 or 24
17.
9= 9, 18, 27, 34
27= 27
GCF= 27
18.
17= 17, 34, 41, 58, 65, 72, 89, 106,
51= 102
19.
24= 24, 48, 72
36= 36, 72
GCF= 72
20.
15= 15, 30, 35, 40
20= 20, 40
GCF= 40
Step-by-step explanation:
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