Help asap please!!
What is the recursive rule for this geometric sequence? 500, 100, 20, 4, ...
What is the recursive rule for this geometric sequence?

500, 100, 20, 4, ...


a1=500; an=−5an−1

a1=2500; an=15an−1

a1=500; an=15an−1

a1=2500; an=−5an−1