Chapter 6.CR, Problem 20CR

To determine

(a)

To write:

The equation of change for $N$.

To determine

(b)

To find:

The plot of $\frac{dN}{dt}$ versus $N$, use it to find the equilibrium solution and to check if the solution corresponds to the threshold level.

To determine

(c)

To find:

The values where the graph is increasing and decreasing.

To determine

(d)

To find:

The situation if initially $N$ is close to $10$ but smaller that $10$ and if initially $N$ is close to $10$ but larger than $10$.