Answer:
The differential equation is
dR/dt = -k(2x - n)dx/dt for k > 0
Assuming initially, one person adopts the innovation, then
dR/dt = 0
Step-by-step explanation:
Total number of people in the community is "n"
At time t, the number of people who
have adopted the innovation is "x(t)"
This Tells us that (n - x) people haven't adopted the innovation.
It is assumed that the rate at which the innovations spread through the community is jointly proportional to the number of people who have adopted it and the number of people who have not adopted it.
So
Let R be the rate, then
R is proportional to x(n - x)
R = kx(n - x) = -kx(x - n)
Differentiating this with respect to time, t, we have
dR/dt = (-k(x - n) - kx)dx/dt
dR/dt = -k(2x - n)dx/dt for k > 0
And this is the differential equation.
Assuming initially, one person adopts the innovation, then
dR/dt = 0
