A continuous-time signal r(t) is shown in the figure below, Sketch and label carefully each of the following signals: (a) [r(t) + x(-t)]u(t) 2 2 1x(t) (b) r(t) [u(t) + u(-t)] 2 3 -5 4 3 -0.5 0.5 (c) x(t) [8(t+1)-8(t-1)] -2 -1 2 1 2 0.5 3 0 4 On 5