Ex.2:

f)

$F(s)=A/(s+\alpha)$; $f(0)=A$; $f(\infty)=0$; Sup=$A/\alpha$;

g)

$G(s)=B\alpha/[s(s+\alpha)]$; $g(0)=0$; $g(\infty)=B$; Sup=$\infty$;

h)

$H(s)=C/(s+\alpha)^2$; $h(0)=0$; $h(\infty)=0$; Sup=$C/\alpha^2$;