What is recursive rule for the sequence?

Hi SJ

We can plug in the values to find the recursive rule.

We plug in n = 1.

$a_1=9(-5)^{1-1}=9$

We imediately eliminate b and c.

We plug in n = 2

$a_2=9(-5)^{2-1}=-45$

We can see that only d works.

That is your final answer,

I hope this helped,

Gavin