a) Signals x1(t) and x2(t) are shown in Figure 1 below. Write the mathematical expression for x1(t) and x2(t) in terms of unit step function. i. ii. Sketch x3 (t) = x2(t – 3)u(t – 4) and write the mathematical expression for x3(t) in terms of unit step function. iii. Sketch x4(t) = x1t). iv. Determine and sketch the output when x, (t) is convolved with x4(t). x1 (t) x2(t) 1 0 1 0 1 2 (a) (b) Figure 1

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