Question

The initial term and common difference are given. What is the nth term of the arithmetic sequence?
a1 = -2; d = 4

Answer 1

Well each term differs from the previous one by 4.

So a2 = a1 + 4
a3 = a2 + 4
a4 = a3 + 4

etc.

Answer 2

so 4 + 4n?

Answer 3

I disagree that it should be 4 + 4n.

Probably should be a(n) = -6 + 4n Since then when n = 1, You'll have a(1) = -6 + 4 = -2 And a1 was given to be -2 so that's right.