How do we determine the input impedance Zin of a non-inverting op amp circuit?.

Assume that the two power supplies used in a comparator are +12 V and -12 V. Remember the +Vsat and -Vsat (limits

for Vout window) are about 1.5 V to 2V below the power supplies. That is, Vout will be bounded between -10.5V and +10.5V. Can anyone try one of the following: (Please show work)

1) Draw the comparator diagram;
2) If Vin(+) = 0.2V and Vin(-)=0V, what is Vout?
3) If Vin(-) = 0.3V and Vin(+)=0V, what is Vout?
4) If Vin(+) = 0.1V and Vin(-)= -0.2V, what is Vout?