Answer
$50$
Work Step by Step
The expression $
\displaystyle\sum_{i=1}^4 5i
$ evaluates to
\begin{array}{l}
5(1)+5(2)+5(3)+5(4)
\\=
5+10+15+20
\\=
50
.\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: 19
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