1.21. A continuous-time signal x() is shown in Figure P1.21. Sketch and label carefully each of the following signals: (a) x(1-1) (b) x(2-1) (d) x(4-5) (e) [x(r) + x(-t)]u(t) (c) x(2r

+ 1) (1) x(r)[8(r+ )-8( - )) DL33