Answer
$3^{4}+3^{5}+3^{6}$
Work Step by Step
We expand the sigma notation by writing $3^{i}$ as $i$ increases from 4 to 6:
$\displaystyle \sum_{i=4}^{6}3^{i}=3^{4}+3^{5}+3^{6}$
Calculus: Early Transcendentals 9th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1337613924
ISBN 13:
978-1-33761-392-7
APPENDIX E - Sigma Notation - E Exercises - Page A 40: 3
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