Answer
$98$
Work Step by Step
The expression $
\displaystyle\sum_{i=1}^7 (3i+2)
$ evaluates to
\begin{array}{l}
(3\cdot1+2)+(3\cdot2+2)+(3\cdot3+2)+(3\cdot4+2)+\\(3\cdot5+2)+(3\cdot6+2)+(3\cdot7+2)
\\=
5+8+11+14+17+20+23
\\=
98
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Sections 11.1-11.3 - Integrated Review - Sequences and Series - Page 653: 20
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