## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$a_{19}=154$
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: $a_{19}=10+8\times(19-1)=154$