Tumor growth The growth of cancer tumors may be modeled by the Gompertz growth equation. Let M(t) be the mass of the tumor for t 2 0. The relevant initial value problem is ам M -аM In K' M(0) = Mo. dt where a and K are positive constants and 0 < Mo < K. M a. Graph the growth rate function R(M) = -aM In K assuming a = 1 and K = 4. For what values of M is the growth rate positive? For what value of M is the growth rate a maximum? b. Solve the initial value problem and graph the solution for a = 1, K = 4, and Mo = 1. Describe the growth pattern of the tumor. Is the growth unbounded? If not, what is the limit- ing size of the tumor? c. In the general equation, what is the meaning of K?

Calculus: Early Transcendentals
8th Edition
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Author:James Stewart
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Chapter1: Functions And Models
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Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Tumor growth The growth of cancer tumors may be modeled by
the Gompertz growth equation. Let M(t) be the mass of the tumor
for t 2 0. The relevant initial value problem is
ам
M
-аM In
K'
M(0) = Mo.
dt
where a and K are positive constants and 0 < Mo < K.
Transcribed Image Text:Tumor growth The growth of cancer tumors may be modeled by the Gompertz growth equation. Let M(t) be the mass of the tumor for t 2 0. The relevant initial value problem is ам M -аM In K' M(0) = Mo. dt where a and K are positive constants and 0 < Mo < K.
M
a. Graph the growth rate function R(M) = -aM In
K
assuming a = 1 and K = 4. For what values of M is the
growth rate positive? For what value of M is the growth rate a
maximum?
b. Solve the initial value problem and graph the solution for
a = 1, K = 4, and Mo = 1. Describe the growth pattern of
the tumor. Is the growth unbounded? If not, what is the limit-
ing size of the tumor?
c. In the general equation, what is the meaning of K?
Transcribed Image Text:M a. Graph the growth rate function R(M) = -aM In K assuming a = 1 and K = 4. For what values of M is the growth rate positive? For what value of M is the growth rate a maximum? b. Solve the initial value problem and graph the solution for a = 1, K = 4, and Mo = 1. Describe the growth pattern of the tumor. Is the growth unbounded? If not, what is the limit- ing size of the tumor? c. In the general equation, what is the meaning of K?
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