Question

Which of the following choices is the simple formula for the nth term of the following arithmetic sequence?

Answer 1

First, we start off with the nth term formula for an arithmetic sequence, which is 
$a_{n} =a_{1}+(n-1)d$

plug in the sequence numbers where they belong

$a_{n}=5+(n-1)*(-4)$
$a_{n}=5+(-4n+4)$
$a_{n}=5-4n+4$
$a_{n}=-4n+9$

And this is the final answer
$-4n+9$