Question 701494
 If the population is decreasing at 2.3% per year and the population is currently 125,000. What is the exponentional model? What will the population be in 15 years? How long will it take to reach 25,000. 
--------------
Each year 97.7% of last year's population survives.
-----
A(t) = 125000(0.977)^t
---
Solve 125000(0.977)^t = 25000
0.977^t = 1/5
---
Take the log and solve for "t":
t = log(1/5)/log(0.977)
---
t = 69 years
================
Cheers,
Stan H.
================