#### Answer

$i$

#### Work Step by Step

$i^{-27}=\dfrac {1}{i^{27}}=\dfrac {i}{i^{28}}=\dfrac {i}{\left( i^{4}\right) ^{7}}=\dfrac {i}{1^{7}}=i$

Published by
Pearson

ISBN 10:
013421742X

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

$i$

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