#### Answer

$i$

#### Work Step by Step

Factor out as many $i^4$ as possible.
$i^{25}=(i^4)^6*i$
Know that $i^4=1$. Substitute, and simplify.
$(i^4)^6*i=1^6*i=i$

Published by
Pearson

ISBN 10:
0321671791

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

$i$

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