Consider the discrete-time impulse response defined by

h[n]=(0.2)ⁿu[n]+(−0.6)ⁿu[n]

(a) Compute the z-transform of h[n]. Express as a single term.
(b) The transfer function becomes the frequency response when z=eʲω. Determine H(eʲω ).
(c) Sketch the pole-zero plot for h[n].