Questionl: (25 points) $$ \begin{array}{1} \text { A- Let } X[n]=\delta[n-4]+3 \deltajn+2|- \delta[n-1] \text { and } h[n 1-2 \delta[n+2]- \delta[n-1] a-\text { Sketch } X[n] \text { and } [n] b \text { - Compute and sketch ) x[n]th[n] c\text { Compute and sketch ) x[n-2]th|en| \end{array) $$ $$ \text - Let ? x(t)=u(t-4)-uct-6) \text { and } h(t)=e^{-2 t] u(t) \text {. Compute } y(t)=x(t) \cdot h(t) \text {. } $$ SP.SD.459