Answer
$2z^3$
Work Step by Step
$2z^3=\underline2\times\underline{z^3}$
$14z^5=\underline2\times7\times\underline{z^3}\times z^2$
$18z^3=\underline2\times3\times3\times\underline{z^3}$
$GCF=2\times z^3 = 2z^3$
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