Question

what iis the 210th term for the arithmetic sequence 3,8,13,18

Answer 1

\[\LARGE a_{210}=a_1+(2n-1)d\]
where n is the number of terms
\[\LARGE a_{210}=3+(2(210)-1)5\]
Do u get it?
Can you solve further?

Answer 2

d is the common difference between any two terms say 3.8 so it'll be
8-3=5
or take 13 and 8
13-8=5..etc