15) Find an and a21 for the arithmetic sequence for which S₁7 = 187 and a₁7 = - 13. Hint: Use the formulas for Sn. an- a21.

College Algebra
10th Edition
ISBN:9781337282291
Author:Ron Larson
Publisher:Ron Larson
Chapter8: Sequences, Series,and Probability
Section8.2: Arithmetic Sequences And Partial Sums
Problem 4ECP: Find the 10th term of the arithmetic sequence that begins with 7 and 15.
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15) Find an and a21 for the arithmetic sequence for which S17
Hint: Use the formulas for Sn.
=
= 187 and a17 = - 13.
an
a21-
Transcribed Image Text:15) Find an and a21 for the arithmetic sequence for which S17 Hint: Use the formulas for Sn. = = 187 and a17 = - 13. an a21-
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