For each of the systems in 4 through 13: a. Find all the critical points (equilibrium solutions). G b. Use an appropriate graphing device to draw a direction field and phase portrait for the system. c. From the plot(s) in part b, determine whether each critical point is asymptotically stable, stable, or unstable, and classify it as to type. d. Describe the basin of attraction for each asymptotically stable critical point.dx/dt = x(2 x y), dy/dt = x + 3y 2xy 1

Intro to Statistics 4.4 Probability & The Multiplication Rule Chapter 4 begins our discussion of probability. In section 1 &2 we learned the basics of probability and in section 3 we learned the addition rule. This section continues our discussion of probability with the multiplication rule,used when you want to ﬁnd the probability of Event A AND Event B happening....