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The gain stages in Op-amp are direct coupled. So, level shifter is used for adjustment of DC level

The output voltage, Vo = -[(Va+Vb+Vc)/3] = -[(3+5+7)/3] =-5v

An averaging amplifier can be used as an averaging circuit, in which the output voltage is equal to the average of all the input voltages

Before applying external input to the op-amp, the output offset voltage should be reduced to zero with the help of an offset voltage compensating network. At this condition, the op-amp is said to be balanced or nulled.

Differential amplifiers are preferred in these applications because they are better able to reject common-mode voltage than single input circuits and present balanced input impedance.

It is not mentioned clearly whether inverting input or non-inverting input is reduced to zero. Therefore, the output cannot be determined.

Open loop configurations are classified according to the number of inputs used and the terminal to which the input is applied when a single input is used.

The source resistances are normally negligible compared to the input resistance. Therefore, the voltage drop across input resistors can be assumed to be zero

The output voltage is equal to the voltage gain times the difference between the two input voltages

In open-loop configuration, due to very high gain of the op-amp, any input signal slightly greater than zero drives the output to saturation level.

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