Answer
$-72$
Work Step by Step
We sum from i = low bound to i = high bound.
$-4(3) + (-4)(4) + (-4)(5) + (-4)(6) = -12-16-20-24 = -72$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Section 11.3 - Series - Exercise Set - Page 651: 12
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