Since it's 8% every year, we have 8% of 600 equals 8*6=48. 48/365 is the amount of interest per day, and 48*45/365 is what you would get over 45 days, which is approximately 5.9 dollars
Note that this is assuming interest is compounded every year
Okay bb
Ummm I think the answer is
Subtract 5y from both sides of the equation
X=13-5y