Consider the discrete-time system below with input  and output . In the figure,  and  denote the impulse responses of LTI Subsystems 1 and 2, respectively. Also,  is the unit impulse, and .

Assuming , the overall system (denoted by the dashed box) is _________.

A causal and stable LTI system with impulse response h(t) produces an output y(t) for an input signal x(t). A signal x(0.5 t) is applied to another causal and stable LTI system with impulse response h(0.5t). The resulting output is_________.

Consider a system with input  and output . The system is