Answer
If we are finding $S_7$, we are finding the first seven terms of the sequence.
Work Step by Step
The subscript on the $S$ tells how many of the first terms of the sequence we find.
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 - Vocabulary, Readiness & Video Check - Page 651: 8
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