#### Answer

Each number is one-third of the number before it.
The next number is -5.

#### Work Step by Step

$-15\times\frac{1}{3}=-5$

Published by
Prentice Hall

ISBN 10:
0133186024

ISBN 13:
978-0-13318-602-4

Each number is one-third of the number before it.
The next number is -5.

$-15\times\frac{1}{3}=-5$

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