Determine whether the following systems are memoryless time invariant linear causal stable y(t) = ax(t -1)/x^2 (t – 1) + b for real-valued signals x(t) and where a and b are positive real numbers y[n] = x[n + 1] – 2x[n] + x[n – 1] y(t) = t^2 d/dt x(t) y[n] = u[n] times [n]Show transcribed image text