Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 11 - Further Topics in Algebra - 11.3 Geometric Sequences and Series - 11.3 Exercises: 4

Answer

$\dfrac {1}{4}$

Work Step by Step

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