#### Answer

$1$

#### Work Step by Step

Factor out as many $i^4$ as possible.
$i^{40}=(i^4)^{10}$
Know that $i^4=1$. Substitute, and simplify.
$(i^4)^{10}=1^{10}=1$

Published by
Pearson

ISBN 10:
0321671791

ISBN 13:
978-0-32167-179-0

$1$

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.