3) After building the adder circuit (Fig. (7)) using just two Vin, V0 = -5.00 V, V1= 5.00 V, and the resistors R0 Rf = 1 kOhms, and R1 = 2 kOhms, the circuit out voltage was calculated using the following relationship, 
and the voltage measured came to, 
verifying that the circuit is working properly.