Answer
$60$
Work Step by Step
$\sum\limits_{i=3}^712=12+12+12+12+12=5\cdot12=60$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Section 11.1 - Sequences and Summation Notation - Exercise Set - Page 829: 26
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