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College Algebra & Trigonometry, 2018a

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158 CHAPTER 3. EXPONENTS AND LOGARITHMS<br />

11) Fish population<br />

The function:<br />

P (t) =<br />

20<br />

1 − 0.4e −0.35t<br />

gives the size of a fish population in thousands at time t, measured in years.<br />

a) Find the initial population of fish at time t =0.<br />

Find the population of fish after 5 years, time t =5.<br />

b) How long will it take for the population to be 25,000?<br />

What happens to this population over time?<br />

12) Fish population<br />

The function:<br />

P (t) =<br />

10<br />

1 − 0.73e −0.08t<br />

gives the size of a fish population in thousands at time t, measured in years.<br />

a) Find the initial population of fish at time t =0.<br />

Find the population of fish after 5 years, time t =5.<br />

b) How long will it take for the population to be 25,000?<br />

What happens to this population over time?

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