Answer
$60$
Work Step by Step
In the the given summation there is no $i$ value.
Thus, we have $\sum_{i=3}^7 (12)=12+12+12+12+12$
$=12 \times 5$
Hence, $\sum_{i=3}^7(12)=60$
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: 38
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