Answer
$34$
Work Step by Step
$\sum ^{3}_{i=1}i2^{i}=1\times 2^{1}+2\times 2^{2}+3\times 2^{3}=2+8+24=34$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 12 - Section 12.1 - Sequences and Summation Notation - 12.1 Exercises - Page 851: 54
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