Answer
$55$
Work Step by Step
Here, we have $\sum_{i=5}^911=11+11+11+11+11$
$=11 \times 5$
Hence, $\sum_{i=5}^911=55$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 10 - Section 10.1 - Sequences and Summation Notation - Exercise Set - Page 1048: 37
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