1.21. A continuous-time signal x(t) is shown in Figure P1.21. Sketch and label carefully each of the following signals: (a) x(t-1) (b) x(2-t) (d) x(4- ) (e) [x(t) + x(-1)]u(t) (c)

x(2t + 1) (f) x(1)[8(t+)-8(1-3)]