The GCF is 6a.
2 x 3 x 3 x a = 18a
They are 1, 2, 3, 4, 6, 9, 12, 18, 36,1a, 2a, 3a, 4a, 6a, 9a, 12a, 18a, 36a,1b, 2b, 3b, 4b, 6b, 9b, 12b, 18b, 36b,1a2, 2a2, 3a2, 4a2, 6a2, 9a2, 12a2, 18a2, 36a2,1ab, 2ab, 3ab, 4ab, 6ab, 9ab, 12ab, 18ab, 36ab,1b2, 2b2, 3b2, 4b2, 6b2, 9b2, 12b2, 18b2, 36b2.
2 x 3 x 3 x a = 18a
Yes.
b 18a 1.8 doc
3(6a + 5) + 30 18a + 15 + 30 18a + 45
32
6a
18a
That depends on the value of a.
18a^3bc
-16A
18a^3bc
If you mean 3a*3a*2a then it is 18a^3 when simplified