39. A population P, grows at the rate P'(t) = 5(t +1) In /t +1 thousand individuals per year at time t (in years). By how much does the population change during the eighth year?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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#39
a certain population will die at age x by the formula
nY P(x) = x²xe-x
where A is a parameter such that 0 < A < e.
a. For a given A, find the maximum value of P(x).
b. Sketch the graph of P(x).
do
c. Find the area under the probability curve
y = P(x) for 0 < x < 10, and interpret your
result.
II
the
39. A population P, grows at the rate
P'(t) = 5(t +1) In vt +1
thousand individuals per year at time t (in years). By
how much does the population change during the
eighth year?
40. Suppose that a drug is assimilated into a patient's
bloodstream at a rate modeled by
-0.31t
A(t) = 2te-
%3D
where t is the number of minutes since the drug was
taken. Find the total amount of drug assimilated into
the patient's bloodstream during the second minute.
41. Recovering from an environmental perturbation, a
(hypothetical) population exhibits dampened oscil-
lations of the form
DOr
N(t) = 100 + 50 sin(27 t) e-0.
-0.01t
individuals per acre
%3D
where t is measured in days. As a part of a sampling
effort, a scientist captures and releases individuals
from this population at a rate of 0.1 N(t) individuals
per acre per day. If the scientist is sampling one acre,
ols she cantures
Transcribed Image Text:a certain population will die at age x by the formula nY P(x) = x²xe-x where A is a parameter such that 0 < A < e. a. For a given A, find the maximum value of P(x). b. Sketch the graph of P(x). do c. Find the area under the probability curve y = P(x) for 0 < x < 10, and interpret your result. II the 39. A population P, grows at the rate P'(t) = 5(t +1) In vt +1 thousand individuals per year at time t (in years). By how much does the population change during the eighth year? 40. Suppose that a drug is assimilated into a patient's bloodstream at a rate modeled by -0.31t A(t) = 2te- %3D where t is the number of minutes since the drug was taken. Find the total amount of drug assimilated into the patient's bloodstream during the second minute. 41. Recovering from an environmental perturbation, a (hypothetical) population exhibits dampened oscil- lations of the form DOr N(t) = 100 + 50 sin(27 t) e-0. -0.01t individuals per acre %3D where t is measured in days. As a part of a sampling effort, a scientist captures and releases individuals from this population at a rate of 0.1 N(t) individuals per acre per day. If the scientist is sampling one acre, ols she cantures
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