#### Answer

-23.5

#### Work Step by Step

If we want to find the 12th term, we have to substitute $n$ by 12:
$a_{12}=(-1)^{12-1}(3.4(12)-17.3)=(-1)^{11}(40.8-17.3)=(-1)23.5=-23.5$

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

-23.5

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