Question: For each system shown in Figure P7.18, find the appropriate static error constant as well as the steady-state error, r() - c(), for unit step,
For each system shown in Figure P7.18, find the appropriate static error constant as well as the steady-state error, r(∞) - c(∞), for unit step, ramp, and parabolic inputs.

R(s) s+ 4 C(s) 5 (s+ 3)(s+ 7) 10 System 1 R(s) C(s) 10 s+ 4 20 (s+ 3)(s+ 7) 5 System 2 FIGURE P7.18
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