$1-$For the network in this figure:

$($a$)$ Determine $Z_i$ and $Z_o.$

$($b$)$ Find $A_v$ and $A_i.$

$($c$)$ Repeat part $($a$)$ with $r_o=20k.$

$2-$For the network in this figure:

$($a$)$ Calculate $I_B,I_C$ and $r_e.$

$($b$)$ Determine $Z_i$ and $Z_o.$

$($c$)$ Calculate $A_v$ and $A_i.$

$($d$)$ Determine the effect of $r_o=30k$ on $A_v$ and $A_i.$

$3-$For the network in this figure:

$($a$)$ Calculate $r_e.$

$($b$)$ Determine $Z_i$ and $Z_o.$

$($c$)$ Calculate $A_v$ and $A_i.$

$($d$)$ Repeat parts $($b$)$ and $($c$)$ with $r_o=25k.$

$4-$ If $A_v=-160$ and $r_o=100k,$ determine $V_{CC}$ for the network in Figure.