Precalculus (6th Edition)

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

Chapter 11 - Further Topics in Algebra - 11.2 Arithmetic Sequences and Series - 11.2 Exercises: 51

Answer

$77.5$

Work Step by Step

$S_{n}=\dfrac {a_{1}+a_{n}}{2}\times n=\dfrac {10+5.5}{2}\times 10=77.5$
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