Answer
The first six terms are:
$-7, -3, 1, 5, 9, 13$
Work Step by Step
The next five terms f the sequence can be found by adding the common difference of $20$ to obtain:
$a_1=-7
\\a_2=-7+4=-3
\\a_3=.-3+4=1
\\a_4=1+4=5
\\a_5=5+4=9
\\a_6=9+4=13$
