2.7-3. Find the inverse z-transform of each E(z) below by the four methods given in the text. Compare the values of e(z), for k = 0, 1, 2, and 3, obtained by the four methods. 0.5 (a) E(z) = 0.5z (2-1)(z -0.6) (b) E(z) = (z - 1)(z - 0.6) (c) E(z) = 0.5(z+1) (z - 1)(z -0.6) z(z - 0.7) (d) E(z) = (z - 1)(z - 0.6)