#### Answer

$-4$

#### Work Step by Step

$d=a_{n+1}-a_{n}=-20-\left( -16\right) =-16-\left( -12\right) =-12-\left( -8\right) =-4$

Published by
Pearson

ISBN 10:
013421742X

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

$-4$

$d=a_{n+1}-a_{n}=-20-\left( -16\right) =-16-\left( -12\right) =-12-\left( -8\right) =-4$

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.