Answer
$-13$
Work Step by Step
Here $a_1=\dfrac{3}{2} $ and $d=-\dfrac{1}{2}$ ; an arithmetic sequence
$a_n=\dfrac{3}{2} +(n-1)(-\dfrac{1}{2})$
Thus,
$a_{30}=\dfrac{3}{2} +(30-1)(-\dfrac{1}{2})=\dfrac{3}{2} -\dfrac{29}{2} $
or, $a_{30}=-13$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 11 - Mid-Chapter Check Point - Page 858: 6
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