(Solved): a) Plot impulse function (t), unit step function u(n), ramp function r(n) and quadratic function ...

a) Plot impulse function $?(t)$, unit step function $u(n)$, ramp function $r(n)$ and quadratic function $q(n)$. b) Plot the shifted version of unit step function $u(n)$ to the right by one unit which is $u(n?1)$ c) Now, take the Fourier Transform of unit step function $u(n)$ and its shifted version of $u(n?1)$. d) Plot the 'sinc' function in the time domain and find it is representation in frequency domain by using Fourier Transform.