Question

I'll give a medal to whoever explains it best.

The first five terms of a sequence are shown below.

5, 9, 13, 17, 21

If the nth term of this sequence is represented by f(n), which of the following functions best represents this sequence?

f(n) = 5n - 1; n ≥ 1

f(n) = 5n + 1; n ≥ 1

f(n) = 4n - 1; n ≥ 1

f(n) = 4n + 1; n ≥ 1

Answer 1

4(1) + 1 = ?
4(2) + 1 = ?
4(3) + 1 = ?
...

Answer 2

5
9
13

Answer 3

Oh wow, ok I'm stupid

Answer 4

is that it?

Answer 5

can I ask you another @zpupster ?