(i) Express f(t) , depicted in the following figure, in termsofthe unit ramp and step functions . a) 2 ft) H—I— -5 -4 -3 -2 -1 I+ + * t 1 2 3 5 -1 (ii) What is the average value ofthe signalf(t) over the interval [-2,4]? (iii) Plot the function f(2t —4)a) (6=2+2+2 marks) Gi) Express f (t), depicted in the following figure, in terms of the unit ramp and step functions 2 -1 (ii) What is the average value of the signal f (1) over the interval [-2,4]? (iii) Plot the function f (21 - 4)