Answer
d)
Work Step by Step
If we want to write the expression in another form:
$5+10+15+20=5(1)+5(2)+5(3)+5(4)=\sum_{k=1}^45k$
The answer is d)
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.1 Sequences and Series - 14.1 Exercise Set - Page 894: 9
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