#### Answer

$\dfrac {1}{4}$

#### Work Step by Step

$a_{n}=4\left( \dfrac {1}{2}\right) ^{n-1}\Rightarrow a_{5}=4\times \left( \dfrac {1}{2}\right) ^{5-1}=4\times \left( \dfrac {1}{2}\right) ^{4}=\dfrac {1}{4}$

Published by
Pearson

ISBN 10:
013421742X

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

$\dfrac {1}{4}$

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