Answer
See below.
Work Step by Step
$a_n=a_{n-1}+5$ and $a_1=-2$ thus
$a_2=a_1+5=-2+5=3$
$a_3=a_2+5=3+5=8$
$a_4=a_3+5=8+5=13$
$a_5=a_4+5=13+5=18$
$a_6=a_5+5=18+5=23$
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