Andy is buying a car He negotiated a 7% decrease on a 6500 car he will pay the full balance 12 equal monthly payments.
Calculate the amount paid each month

541.596

I think this is right I am not good at math

answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !