#### Answer

$M=8z$

#### Work Step by Step

Since we are told that $M$ varies directly as $z$, we have:
$M=kz$
We are given: $M=120$ and $z=15$, so we have:
$120=k*15$
$k=8$
Thus, the equation is:
$M=8z$

Published by
Brooks Cole

ISBN 10:
1305115546

ISBN 13:
978-1-30511-554-5

$M=8z$

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