1.- Design MATLAB-Simulink program as shown in Figure 1. Set the frequency of the "Sine-Wave" components to-"20" Hz, "60" Hz-and"80" Hz. Set the "Lowpass Filter" component to filter the signal with 80 Hz frequency: 1 LDSP Sine Wave Time Soope SP Sine Wavet Add B-FFT Spec Scope DSP Time Soopet Sine Wave Lowpas Lowpass Filter Spectrum Scope Figure 1 - MATLAB-Simulink program 1 2.- Referring to Figure 1, by using the same input signal, design MATLAB Simulink program to-filter the input signal of 20 Hz component. I -3--Again, by referring to Figure 1 and using the same input signal, design-MATLAB-Simulink program to. -filter the input signal with frequency component of 60 Hz