The Gompertz model has been used to model population growth. dy/dt = ry ln(K/y), where r= 0.73 per year, k= 33,800 kg, (y_0)/(k)= 0.27. Use the Gompertz model to find the predicted value of y(3). Round your answer to the nearest integer

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2022-08-19

The Gompertz model has been used to model population growth.
dydt=ryln(Ky),
where r=0.73peryear,k=33,800kg,y0k=0.27Use the Gompertz model to find the predicted value of y(3)Round your answer to the nearest integer

Answer & Explanation

blerbintiy0

blerbintiy0

Beginner2022-08-20Added 8 answers

Consider the following differential equation:
dydt=ryln(Ky)wherer=0.73peryear,k=33,800kg,y0k=0.27
The objective is to find the predicted value of y(3) by using Gompertz model.
Given dydt=ryln(Ky), it is variable separable equation as r and K are constant. This implies,
dyylnKy=rdt
Integrate on both sides,
dyylnKy=rdt
dyylnKy=rt+c
where c is an arbitrary constant.
Now, use u-substitution method as follows:
u=Ky
du==Ky2dy
dy=(y2K)du
This implies,
1yln(u)(y2K)du=rt+c
=yKln(u)du=rt+c
(Ku)Kln(u)du=rt+c
1uln(u)du=rt+c
Assume v = ln (u) which implies,
dv=1udu
du=udv
Substitute this in the above integration to get,
1vdv=rt+c
ln(v)=rt+c
ln(ln(u))=rt+c(v=ln(u))
ln(u)=cert
u=ecert
Ky=ecert
y=Kecert
Since r=0.73,k=33.800,y0k=0.27
This implies y0=9126att=0,stitutethegivenvaluetheexpressiony=Kecert.
9126=33800ece0.73(0)
9126=33800ece0
ec=338009126
c=ln(10027)
c=1.309
Now, we find the value of y(3), substitute all the known values in the expression y=Kecert.
y=33800e1.309e(0.73)(3)
=29193.96
29194
Therefore, the value of y(3) by using Gompertz model is 29194.

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