Answer:
380
Step-by-step explanation:
This can be represented as a sequence, with the first term being 20 and the common difference being 30. The general form can then be found using
[tex]a_n=20+30(n-1)[/tex]
For the 13th term,
[tex]a_{13}=20+30(13-1)\\\\a_{13}=20+30(12)\\\\a_{13}=20+360=380[/tex]