Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 11 - Section 11.2 - Arithmetic and Geometric Sequences - Exercise Set: 13



Work Step by Step

To find the $n$th term of an arithmetic sequence, we use the formula $a_n = a_1 + (n-1)d$ where $a_1$ is the first term and $d$ is the common difference. $a_{15} = -4 + (15-1)\cdot(-4) = -4 +14\cdot(-4) = -4 +(-56) = -60$
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