Question

The fish population in a local stream is decreasing at a rate of 2.5% per year. The original population was 45,000. Write an exponential function to model this situation. Use y and x as your variables.

Answer 1

y=45000(1-0.03)^x

Explanation:

1) the exponential decay formula is

y=c(1-r)^x

where c= starting amount

r=rate of change

x=time

so

y=45000(1-0.03)^x

y=45000-1350x