First, we need to find the transfer function for each given system.
a) For the first system, we have:
$$
F(s) = \frac{5s + 10}{s^2 + 5s + 10}
$$
b) For the second system, we have:
$$
F(s) = \frac{15}{s^3 + 3s^2 + 5s + 15}
$$
c) For the third system, we
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