Answer
$a_6=33$
Work Step by Step
The $n^{th}$ term of an arithmetic sequence can be found using the formula:
$a_n = a_1 + (n-1)d$
where
d = common difference
$a_1$ = first term
The given arithmetic sequence has:
$a_1 = 13
\\d=4
\\a_n= n^{th} \text{ term}$
Use the formula above to find the 6th term:
$a_n=a_1+(n-1)(d)
\\a_6=13 + (6-1)4
\\a_6=13+5(4)
\\a_6=33$