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 - Guided Practice for Examples 5 and 6 - Page 805: 5



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: $$S_n=12[\frac{(2+7(1))+(2+7(12))}{2}]=570$$
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