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: $a_1=-7 \\a_2=-7+4=-3 \\a_3=.-3+4=1 \\a_4=1+4=5 \\a_5=5+4=9 \\a_6=9+4=13$
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