For each of the systems described by the following differential/difference equations, find the system transfer function:
a) d^2y/dt^2 + 11dy/dt + 24y(t) = 5dx/dt + 3x(t)
b) d^3y/dt^3 + 6d^2y/dt^2 - 11dy/dt + 6y(t) = 3d^2x/dt^2 + 7dx/dt + 5x(t)
c) d^4y/dt^4 + 4dy/dt = 3dx/dt + 2x(t)
d) y[n] = 2y[n - 1] - 5y[n - 2] + x[n] + 3x[n - 2]