College Algebra (6th Edition)

by Blitzer, Robert F.

Published by Pearson

ISBN 10: 0-32178-228-3

ISBN 13: 978-0-32178-228-1

Chapter 8 - Mid-Chapter Check Point - Page 743: 12

Answer

$44$

Work Step by Step

$\sum_{i=1}^{4} (i+4)(i-1)=((1+4)(1-1))+((2+4)(2-1))+((3+4)(3-1))+((4+4)(4-1))=5\cdot0+6\cdot1+7\cdot2+8\cdot3=0+6+14+24=44$

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