
Concept explainers
(a)
To write: a recursive sequence that given the population pn of trout in the lake in terms of the year n , with n=0 corresponding to 2015.
(a)

Answer to Problem 123E
The recursive sequence that gives the population of trout in the lake in terms of year n is:
pn=(0.75)Pn−1+500
Explanation of Solution
Given information:
A landlocked lake has been selected to be stocked in the year 2015 with 5500 trout, and to be restocked given year thereafter with 500 trout. Given year the fish population declines 25%duw to harvesting and other natural causes.
Calculation:
The recursive sequence that gives the population of trout in the lake in terms of year n is:
P0=5500pn=(0.75)Pn−1+500
(b)
To find: the numbers of trout in the lake for n=1,2,3 and 4.
(b)

Answer to Problem 123E
The numbers of trout in the lake are:
4625, 3969, 3477, 3108
Explanation of Solution
Given information:
A landlocked lake has been selected to be stocked in the year 2015 with 5500 trout, and to be restocked given year thereafter with 500 trout. Given year the fish population declines 25%duw to harvesting and other natural causes.
Calculation:
To find the numbers of trout in the lake, substitute n=1,n=2,n=3,n=4 in the sequence one by one.
P1=(0.75)P1−1+500=(0.75)(5500)+500=4625P2≈3969P3≈3477P4≈3108
Thus, the numbers of trout in the lake are:
4625, 3969, 3477, 3108
These values represent the number of trout in the lake for the years 2016 through 2019.
(c)
To find: the number of trout in the lake as time passes infinitely using graphing utility.
(c)

Answer to Problem 123E
The number of trout in the lake is found as 2000 trout.
Explanation of Solution
Given information:
A landlocked lake has been selected to be stocked in the year 2015 with 5500 trout, and to be restocked given year thereafter with 500 trout. Given year the fish population declines 25%duw to harvesting and other natural causes.
Calculation:
Using graphing utility, the number of trout in the lake is found as 2000 trout.
As time passes the population of trout decreases at a decreasing rate. Because the population is growing smaller and still decline 25%, each time 25% is taken from a smaller number, there is a smaller decline in the number of trout.
Chapter 8 Solutions
Precalculus with Limits: A Graphing Approach
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