Answer:
5 years
Step-by-step explanation:
18= 9(1.15)^x
Divide each side by 9
18/9= 9/9 *(1.15)^x
2 = 1.15 ^x
Take the log on each side
log (2) = log (1.15^x)
log 2 = x log 1.15
Divid each side by log (1.15)
log 2 / log 1.15 = x log 1.15/ log 1.15
log 2 / log 1.15 = x
4.959484455 = x
To the nearest year
5 years
