## Intermediate Algebra for College Students (7th Edition)

$29$
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, $a_{16}+b_{18}=29$