In the past you paid $800 per month to rent your apartment. You now pay $900 per month for your rent. What is the percent increase in your rent?
y = 800 (1.125)^x
it would be 12.5%
if you graph that equation the intersection would be (1,900)
(i don't know if you learned this in Algebra 2. but this formula works though)
i hope i helped a bit