Help please! My teacher is no help!

Question

In 1997 the population in Croatia was 5,000,000 the projected population in 2020 was 4800,000. Find the exponential growth model y=ae^bt for the population in Croatia by letting t= 0 correspond to 1997. Use the model to predict the population in 2030

Answer 1

1997 5 million

2020 4.8 million

2030 ?? about 4.16 million

A = 5e^rt

4.8 = 5e23r

ln(4.8/5) = 23r

r = (ln(.96)/23 = annual "growth" (negative) rate = about - 0.1775% per year

A = 4.8e^(10/23)ln.96 = about 4,155,578 in 2030 in Croatia

rounded to nearest integer/person