#### Answer

$-5$

#### Work Step by Step

$d=a_{n+1}-a_{n}=-12-\left( -7\right) =-7-\left( -2\right) =-2-3=-5$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$-5$

$d=a_{n+1}-a_{n}=-12-\left( -7\right) =-7-\left( -2\right) =-2-3=-5$

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