please urjent

(2 marks) Draw the graphical representation of the following functions i) x[n]= 2u[n] - 2u[n- 3]+38[n-2] ii) y(t) = 2u(t) + 3u(1-2) iii) z(t)=2x(t + 2) where x(t) = u(t) (1.5 marks) (1.5 marks)