Answer
$147$
Work Step by Step
Since, we have
$\sum_{i=1}^{6}(7i)=7(1)+7(2)+7(3)+7(4)+7(5)+7(6)$
or, $=7+14+21+28+35+42$
Hence, we get
$=147$
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: 18
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