Answer
$20$
Work Step by Step
The $n^{th}$ term ($a_n$) of an arithmetic sequence can be found using the formula $a_n=a_1+(n-1)d$.
where, $a_1$ is the first term and $d$ is the common difference(is the difference between a term and the term proceeding it), that is, $d=a_n-a_{n-1}$
From the given sequence, we have: $a_1=6$ and $d=2$.
Substitute these values in the formula above and evaluate for $n=8$( eighth term).
$a_8=6+(8-1)(2) \\=6+14\\=20$
Therefore, the eighth term of the given arithmetic sequence is $20$.
