Since 10 is a factor of 30, it is automatically the GCF.
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The GCF is 15.
prime
The grouping of the factors of w^2 + 30w + 81 (a perfect square) is (w + 27) and (w + 3)3 is a prime factor of 27, 30 and 81 but without two terms to compare, there won't be a GCF (not gfc)
The GCF is 8.
The GCF is 3.