Comsider the following aurplifier. Assume $|VBE|=0\mathrm{.}7V.$

a$)$ Perform au affruximate de aualysis and find: $I_1,I_2{V}_{\text{e}\text{n}\text{I}},V{C}_1,V_{E4},V_{C4}$ and $V_0.$

b$)$ Does aq operate in active usole? Why? ${?}^2?$

c$)$ Assumze $=100$ and find: $($ac aualysis$)A_{c_M}=\frac{v_0}{v_d},$ Rid,

d$)$ Find CHRR for first differentinl amplifier, assume the Cincurt is Open at terminal AB

NOTE: only parts $($a$)$ and $($b$)$ requine numerical anwers.