Question

Consider the sequence -7, 3, 1, 5, 9,...What is f(2)?

Answer 1

`f(2)=3`

Explanation:

I've made several assumptions here:
[1]`color(white)("XXX")f` is a function which defines the sequence
[2]`color(white)("XXX")`the first element of the given sequence is `f(1)`

Under those conditions:
`color(white)("XXX")f(1)=-7`
`color(white)("XXX")f(2)=3`
`color(white)("XXX")f(3)=1`
`color(white)("XXX")f(4)=5`
`color(white)("XXX")f(5)=9`