6. For each of the transfer functions shown below, find the locations of the poles and zeros, plot them on the s-plane, and then write an expression for the general

form of the step response without solving for the inverse Laplace transform. State the nature of each response (overdamped,underdamped, and so on). [Sections: 4.3,4.4] \text { b. } T(s)=\frac{5}{(s+3)(s+6)} \text { d. } T(s)=\frac{20}{s^{2}+6 s+144} T(s)=\frac{(s+5)}{(s+10)^{2}}