Use MATLAB to plot the following functions (signals): y(t) = 3u(t) y(t) = t^3 + 2t y(t) = 10 sin(t) e^0.5t y (t) = 10 sin(t) e^2t y(t) = 10 sin(t) e^j0.8 t For these functions make the values of the variable "t" between -50 to +50 and use built-in heaviside function from MATLAB to generate the unit step function