Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 12 Sequences and Series - 12.2 Analyze Arithmetic Sequences and Series - 12.2 Exercises - Skill Practice - Page 807: 42



Work Step by Step

For an arithmetic series, we know the following equation: $$S_n=n\frac{a_1+a_n}{2}$$ Thus, we find: $$S_n=18[\frac{(14-6(1))+(14-6(18))}{2}]=-774$$
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