Answer
$a_{19}=154$
Work Step by Step
In an arithmetic sequence, first we have to find the common difference, which can be calculated as the difference of any two subsequent terms:
$d=a_2-a_1=18-10=8$
The n th term can be calculated as:
$a_n=a_1+d\times(n-1)$
The 19th term is:
$a_{19}=10+8\times(19-1)=154$
