Determine the impulse response and the unit step response of the systems described by the difference equation (a) y(n) = 0.6y(n-1)-0.08y(n-2) + x(n) (b) y(n) = 0.7y(n-1)-0.1y(n-2) + 2x(n)-x(n − 2) Question_19: Determine the range of values of the parameter a for which the linear time-invariant system with impulse response i(n) = { o n≥0, n even Ja", 0, otherwise is stable. Question_20: Determine the response of the system with impulse response h(n) = a" u(n) to the input signal x(n) = u(n) - u(n - 10)