Answer
$29$
Work Step by Step
For $n=16$; we have $a_{16}=1+17(-3-1)=-59$
and
For $n=18$; we have $b_{18}=3+17(8-3)=88$
Thus, $a_{16}+b_{18}=-59+88$
or, $a_{16}+b_{18}=29$
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 - Section 11.2 - Arithmetic Sequences - Exercise Set - Page 840: 52
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