Answer
The first six terms are:
$200, 220, 240, 260, 280, 300$
Work Step by Step
The next five terms f the sequence can be found by adding the common difference of $20$ to obtain:
$a_1=200
\\a_2=200+20=220
\\a_3=220 + 20 = 240
\\a_4=240+20 = 260
\\a_5=260+20=280
\\a_6=280+20=300$
