Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1




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)
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