I'm working on exponential regression and have a table that compares student credit card debit each month after graduation. So it goes something like this:

Question

I'm working on exponential regression and have a table that compares student credit card debit each month after graduation. So it goes something like this: 
Month            1              2              3           4 
Debt              $1           $2            $4          $7

(Just put in these numbers for reference, to ask my question)

So the question is -- how much is a student's credit card one year after graduating?

Do I use 12 as the x in the equation y = ab^x, or do I use 13 so I can go all way the through the 12th month?

Thank you.

Anonymous · Answer

12 say graduated on Jan 15 first payment Jan 30 , last payment Dec 30