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PAGE: 371SET: ExercisesPROBLEM: 110
Please look in your text book for this problem Statement

The fish population increases according to the logistic curve is , where is measured in months.

(a)

Graph:

Graph the function .

(b) What is the limiting size of the fish population.

The limiting size of the fish population is .

.

The limiting population is .

(c) At what rates is the fish population changing at the end of month and at the end of months.

Apply derivative on each side with respect to .

 

.

The rate of change of fish population at the end of month.

Substitute in .

.

The rate of change of fish population at the end of month is .

The rate of change of fish population at the end of months.

Substitute in .

.

The rate of change of fish population at the end of months is .

(d) After how many months is the population increasing most rapidly.

Again apply derivative on each side with respect to .

.

The maximum value of occurs at .

Apply log on each side.

.

The population increasing most rapidly after months.

(a)

Graph:

Graph the function .

(b) The limiting population is .

(c)

The rate of change of fish population at the end of month is .

The rate of change of fish population at the end of months is .

(d) The population increasing most rapidly after months.



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