Transducer, ADC, Bandwidth of system response

Please see attachment for full question with diagram.

(a) Calculate the change in output code from the ADC for the transducer if the gap is changed from 500 micrometers to 600 micrometers.

(b) If the transducer was removed from the circuit what would be the DC offset voltage measured at the output?

(c) What is the bandwidth of the system response to changes in input gap?

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... (3)
(Consider the feature of a ideal op-amp, this negative input of op-amp is virtually connected to positive input, thus connected to ground)

where V(in) = V(sensor_ref); This is done when the SW turns to left.

V(ADC_ref) * SUM ...