Calculus 10th Edition

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

Answer

$420$

Work Step by Step

$\sum ^{20}_{i=1}2i=2\sum ^{20}_{i=1}i=2\times \left( \dfrac {n\times \left( n+1\right) }{2}\right) =2\times \left( \dfrac {20\times \left( 20+1\right) }{2}\right) =420$
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