$9\mathrm{.}3.$ Consider the signal

$x(t)=e^{-5t}u(t)+e^{-t}u(t),$

and denote its Laplace transform by $x(s).$ What are the constraints placed on the real and imaginary parts of $$ if the region of convergence of $x(s)$ is Qe$\{\{s\}>-3?$

$9\mathrm{.}4.$ For the Laplace transform of