The autonomous differential equations in Exercises 9–12 represent models for population growth. For each exercise, use a phase line analysis to sketch solution curves for P(t), selecting different starting values P(0). Which equilibria are stable, and which are unstable?

9.. dP/dt  = 1 - 2P

10. dp/dt= 2P(P - 3)

11. dP/dt = P(1 - 2P)

12. dp/dt= 3P(1 - P)(P - 1 /2)

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