Can someone help me with writing an equation for the nth term of 3,8.5,14 and 19.5?

Answer 1

the Arithmetic Sequence Formula is:

a_n=a₁+(n-1)d where a_n is the n^th term, a₁ is the first term and d is the common difference

the first term is 3 and the common difference is 5.5 (add 5.5 to each term to get the next term)