5. Textbook 1.9 (a), (b) and (e). Determine whether or not each of the following signals is periodic. If a signal is

periodic, specify its fundamental period.

(a) x₁ (t) = je/10t

(b) x₂ (t) = e(-1+f)t

(e) x5 [n] = 3e(n+1)