#### Answer

$2\times3\times3\times5$

#### Work Step by Step

We create a factor tree.
$90$
$/\ \backslash$
$45\ \ 2$
$/\ \backslash$
$15\ \ 3$
$/\ \backslash$
$5\ \ 3$

Published by
Brooks Cole

ISBN 10:
1285199197

ISBN 13:
978-1-28519-919-1

$2\times3\times3\times5$

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