Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 12 - Section 12.2 - Arithmetic Sequences - 12.2 Exercises - Page 857: 53



Work Step by Step

$S_{n}=\dfrac {n}{2}\left( a+\left( n-1\right) d\right) =\dfrac {15}{2}\left( -40+\left( 15-1\right) \times 14\right) =\dfrac {15}{2}\times 156=1170$
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