Answer
$a_9=83$
Work Step by Step
$a_1=3,~~a_2=13$
$d=a_2-a_1=13-3=10$
$a_n=a_1+(n-1)d$
$a_9=3+(9-1)10=3+(8)10=3+80=83$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.2 - Arithmetic Sequences and Partial Sums - 11.2 Exercises - Page 786: 42
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