Intermediate Algebra for College Students (7th Edition)

Published by Pearson
ISBN 10: 0-13417-894-7
ISBN 13: 978-0-13417-894-3

Chapter 11 - Test - Page 871: 6



Work Step by Step

Here, $a_1=-7, d=-7$ Sum of first $10$th term of an arithmetic sequence can be calculated as: $S_n=\dfrac{n}{2}[2a_1+(n-1)d]$ Now, $S_{10}=\dfrac{10}{2}[2(-7)+(10-1)(-7)]=5[-14+(9)(-7)]$ or, $=-385$
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