Answer
$820$
Work Step by Step
Recall the formula: $\sum_{i=1}^{n}k = \dfrac{n(n+1)}{2}$
Apply the formula above to obtain:
$\sum_{k=1}^{40} k = \dfrac{40(40+1)}{2} \\=\dfrac{(40) (41)}{2} \\=820$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 11 - Sequences; Induction; the Binomial Theorem - Section 11.1 Sequences - 11.1 Assess Your Understanding - Page 828: 71
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
