Work Step by Step
$a_1=3,~~a_2=13$ $d=a_2-a_1=13-3=10$ $a_n=a_1+(n-1)d$ $a_9=3+(9-1)10=3+(8)10=3+80=83$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.