Answer:
GCF = 6
18 + 30 = 6 x (3 + 5)
Explanation:
see explanation
listing the factors to find the GCF
factors of 18 : 1, 2, 3, 6, 9, 18
factors of 30 : 1, 2, 3, 5, 6, 10, 15, 30
common factors are 1, 2, 3, 6
the GCF = 6
then
18 + 30 = 6 × (3 + 5)
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