Answer
$420$
Work Step by Step
$\sum ^{20}_{i=1}2i=2\sum ^{20}_{i=1}i=2\times \left( \dfrac {n\times \left( n+1\right) }{2}\right) =2\times \left( \dfrac {20\times \left( 20+1\right) }{2}\right) =420$
Calculus 10th Edition
by Larson, Ron; Edwards, Bruce H.
Published by
Brooks Cole
ISBN 10:
1-28505-709-0
ISBN 13:
978-1-28505-709-5
Chapter 4 - Integration - Review Exercises - Page 312: 25
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