Answer
$252$
Work Step by Step
For an arithmetic series, the sum for the finite series is given by:
$S_n=\dfrac{n(a_1+a_n)}{2}$
Thus, we have
$S_{9}=\dfrac{9 \times (66+18)}{2}=252$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 12 Sequences and Series - 12.2 Analyze Arithmetic Sequences and Series - 12.2 Exercises - Skill Practice - Page 807: 44
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