(a) Derive the Z-transform and its region of convergence for each of the following signals: Xn = 3:{})". no (i) [4 marks] n] = 2n, no (ii) [7 marks] (b) Find the inverse Z-transforms of each of the following expressions: 1 X(z) = 13 2-1+1 (i) 2 marks] 1- -2 4 [5 1+ 2-1 X(Z) = M 1 2 19 marks)