1. what is the common-mode voltage of the balanced (both voltage dividers contain two identical resistances) wheatstone bridge in fig. 1? 2. what is the differential gain of the non-inverting stage of the instrumentation amplifier in fig. 3? 3. what is the differential gain of the difference stage of the instrumentation amplifier in fig. 4? 4. what is the overall differential gain of the instrumentation amplifier in fig. 4?