5. Determine whether the following systems have the properties linearity, time invariance, BIBO stability, memory, causality, or invertibility. If the system is invertible, find its inverse. (56 points total) (a) y(t) = (t2 - 1)x(t - 1) (14 points) (b) yln] = e-x) (14 points) (c) y(t) = 1 - x(t) (14 points) (d) yln] = En xin] where no is a fixed, finite time (14 points)