we have the exponential decay function

Part b
Estimate the population of the country in 2018
Remember that
t=0 -----> year 1995
so
t=2018-1995=23 years
substitute in the function above

Part c
After how many years will the population of the country be 2 million, according to this model?
For P(t)=2
substitute

Solve for t

Apply ln on both sides


t=229 years