Algebra 2 (1st Edition)

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

Chapter 13, Trigonometric Ratios and Functions - 13.3 Evaluate Trigonometric Functions of Any Angle - 13.3 Exercises - Mixed Review - Page 872: 54



Work Step by Step

$\sum_{i=1}^{5} 2(3^{i-1})=2 \times [\dfrac{3^6-1}{3-1}]$ $=2 \times [\dfrac{3^5-1}{3-1}]$ $=2 \times [\dfrac{243-1}{3-1}]$ $=2 \times [\dfrac{242}{2}]$ $=242$
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