College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 9 - Section 9.2 - Arithmetic Sequences - 9.2 Assess Your Understanding - Page 654: 3



Work Step by Step

In an arithmetic sequence, the nth term is $a_{n}=a_{1}+(n-1)d$ Given the 5th term, $12=a_{1}+(5-1)5$ ... solve for $a_{1}$ $12-20=a_{1}$ $a_{1}=-8$ So $a_{6}=-8+(6-1)5=17$
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