#### Answer

$a.$ $y^{4}$
$b.$ $x$

#### Work Step by Step

a. Since they are all the same variable, it would be the smallest exponent to which y is raised, or 4; hence, $y^{4}$.
b. The GCF is $x^{1}$ or $x$, since $1$ is the smallest exponent raise to $x$.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$a.$ $y^{4}$
$b.$ $x$

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