Question 1077445
The number of cases is growing by 9% each year, so after 7 years, we have:
a)N=5000*(1+.09)^7=5000*1.82803912081669=9140.195 cases.
b)11000=5000*(1.09)^t
2.2=1.09^t
ln 2.2=ln 1.09^t=t ln 1.09
t=ln 2.2/ln 1.09=9.1492044 years after the first cases were reported. ☺☺☺☺