1. For the inverting, summing amplifier shown, find the voltage gain relationship
(i.e., relationship between output v_{o} and inputs v_{a},
v_{b}).

2. For the circuit of figure 3 in the lab:

a) Find the input impedance to the right of V_{1}.

b) What is the output impedance of the amplifier circuit?

3. For the circuit of figure 4 in the lab:

a) What is the voltage gain of this circuit?

b) What is the input impedance of this circuit?

c) What is its output impedance of this circuit?