Answer True or False for each statement: 1- The signal x[n]= 5 cos (n/7) is periodic signal. 2- The signal x(t)= 5 cos (2t) is power signal. 3- The even part of the signal x(t)= u(t) is y(t) = 1 Aet>0 x (1) = { 4- The signal otherwise is energy signal if a=0.5 5- The impulse response of two parallel systems is the convolution of their 0, impulse responses. 6- The system y(t)= d/dt{ x(t)} is invertible. 7- All causal Systeins are memory-less Systems. 8- The system y(t) = {4 x(t) + 3} is Non-linear system.