Concept explainers
a.
To write: a recursive sequence that gives the population pn of trout in the lake in terms of the year n, with n = 0 corresponding to 2020.
a.

Answer to Problem 130E
The recursive sequence that gives the population pn of trout in the lake in terms of the year n is: Pn=0.75Pn−1+500.
Explanation of Solution
Given information: A landlocked lake has been selected to be stocked in the year 2020
with 5500 trout and to be restocked each year thereafter with 500 trout. Each year the fish population declines 25% due to harvesting as well as natural causes.
Calculation:
The recursive sequence that gives the population pn of trout in the lake in terms of the year n is:
P0=5500.Pn=0.75Pn−1+500.
b.
To find: the numbers of trout in the lake for n = 1, 2, 3 and 4 and interpret these values in the context of the situation.
b.

Answer to Problem 130E
In 2021, there will be P1=4625 fish.
In 2022, there will be P2=3969 fish.
In 2023, there will be P3=3477fish.
In 2024, there will be P4=3107 fish.
Explanation of Solution
Given information: Pn=0.75Pn−1+500.
Calculation:
In 2021, there will be P1=0.75P0+500=0.75×5500+500=4625 fish.
In 2022, there will be P2=0.75P1+500=0.75×4625+500=3969 fish.
In 2023, there will be P3=0.75P2+500=0.75×3969+500=3477fish.
In 2024, there will be P4=0.75P3+500=0.75×3477+500=3107 fish.
c.
To find: the number of trout as time passes infinitely using a graphing utility and explains.
c.

Answer to Problem 130E
2000 trout.
Explanation of Solution
Given information: Pn=0.75Pn−1+500.
Calculation:
∞∑p=00.75Pn−1+500=2000 trout. As time passes, the population of trout decreases at a decreasing rate. Because the population is growing smaller and still declines 25 %, each time 25% is taken from a smaller number there is a smaller decline in the number of trout.
Chapter 8 Solutions
PRECALCULUS W/LIMITS:GRAPH.APPROACH(HS)
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