Control Systems
Weighting function is in terms of -----------------

 Laplace transform of the parabolic response
 Laplace transform of the ramp response
 Laplace transform of the step response
 Laplace transform of the impulse response

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 each system in the cascade is individually caused and unstable.
 the majority are unstable and the majority are causal.
 at least one system is unstable and at least one system is causal.
 at least one system is causal and all systems are unstable.

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