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1.2 Sketch the following discrete-time signals and label the amplitudes and the time-axis. 1.2.1 \( x[k]=u[k+4]-u[k-3]+3 \delta[k+1]-2 \delta[k-2] . \) 1.2.2 \( x[k]=\delta[k+1]-2 \delta[k]+\left(k^{2}-2\right) \delta[k-1] \). 1.2.3 \( x[k]=\sum_{m=0}^{4} m \delta[k-m] . \) \( 1.3 \) Given the discrete-time signal \( x[k] \). Plot the following signals: 1.3.1 \( x[-k] \) 1.3.2 \( x[k] \delta[k+1] \) 1.3.3 \( x[k+1] \delta[k-1] \)