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systems described by the following impulse responses:

h[n]=(0.9)[itex]^{n}[/itex]e[itex]^{j(\pi/2)n}[/itex]u[n]

So I am completely confused. . . I don't even know how to start. . . I want to say that I need to do a summation but the more examples and text I look up the more I'm in the dark. . . any help is appreciated.

The only thing I can think to start is you assume

x[n] = u[n]