Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 9 - Sequences and Series - 9-2 Arithmetic Sequences - Practice and Problem-Solving Exercises - Page 575: 27


The $17^{\text{th}}$ term is $18$.

Work Step by Step

The$16^{\text{th}}$ is $21$ and the common difference is $-3$ so we simply add $-3$ to $21$ to get the $17^{\text{th}}$ term: $a_{17}=a_{16}+d $ $a_{17}=21+(-3)$ $a_{17}=18$
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