Question

Given an arithmetic sequence in the table below, create the explicit formula and list any restrictions to the domain.

n an
1 9
2 3
3 −3

Answer 1

do you know what is an aritmetic sequence ?

do you know this : In an Arithmetic Sequence the difference between one term and the next is a constant

so in your posted case what may be this constant ?

how you get from 9 this 3 ? or how many you need adding to 3 for get -3 ?

hope helped