Algebra and Trigonometry 10th Edition

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



Work Step by Step

$a_1=3,~~a_2=13$ $d=a_2-a_1=13-3=10$ $a_n=a_1+(n-1)d$ $a_9=3+(9-1)10=3+(8)10=3+80=83$
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