Answer
$y^7$
Work Step by Step
To find the GCF, factor each number. The product of the common factors is the greatest common factor.
$y^{7}=\underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y$
$y^{7}=\underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y$
$y^{10}=\underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y\times y \times y\times y$
$GCF=\underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y\times \underline y=y^7$
