[Ulaby and Yagle, 2018]: Given x(t)=\left\{\begin{array}{ll}

4-(4 / 3)(t-3), & \text { for } 3

0, & \text { elsewhere }

\end{array}\right. generate and plot the following: \text { 1) } x(3 t+6) \text {. } \text { 2) } x(-3 t+6) \text {. } \text { 3) } x(-3 t-6) \text {. }