Answer
$z^{7}$
Work Step by Step
$z^{7}$ $z^{9}$ $z^{11}$
$z^{7}$ = z.z.z.z.z.z.z
$z^{9}$ = z.z.z.z.z.z.z.z.z.
$z^{11}$ = z.z.z.z.z.z.z.z.z.z.z
GCF =z,z,z,z,z,z,z= $z^{7}$
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