Precalculus: Mathematics for Calculus, 7th Edition

$a_{n}=-0.5-0.2n$ $a_{10}=-2.5$
The nth term of an arithmetic sequence is $a_{n}=a+(n-1)d$ ---------------- $a_{n}=-0.7-0.2(n-1)$ $a_{n}=-0.7-0.2n+0.2$ $a_{n}=-0.5-0.2n$ $a_{10}=-0.5-0.2(10)=-0.5-2=-2.5$