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SOLVED: Texts: Problems 8 through 13 involve equations of the form dy/dt = f(). In each problem, sketch the graph of f() versus t, determine the critical (equilibrium) points, and classify each as asymptotically stable, unstable, or semistable (see Problem 7). Draw the phase line and sketch several graphs of solutions in the ty-plane.8. dy/dt = k√(6 - t), k > 0, -∞ 0, b > 0, Yo > 012. dy/dt = y(4 - y), -∞ < t < ∞, C < Yo < 013. dy/dt = y(-y), 0 < t < ∞, 0 < Yo < ∞