Algebra 2 (1st Edition)

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

Chapter 12 Sequences and Series - 12.1 Define and Use Sequences and Series - Guided Practice for Example 4 - Page 796: 9


$\displaystyle \sum_{i=1}^{8}(i+4)$

Work Step by Step

From the given terms, we observe the pattern $5=4+1$ $6=4+2$ $7=4+3$ $...$ $12=4+8$ So, there are 8 terms in all, counting each as $a_{i}, i=1,2,...8,$ (lower limit is 1, upper is 8) Sum = $\displaystyle \sum_{i=1}^{8}(i+4)$
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