Part 1. For the differential configuration,
vo = Rf/Ri (v1 - v2)
If vo = v1 + 5V is desired, what should Rf/Ri and v2 be?
Part 2. Use a voltage divider formed from two resistors R1 and R2 and one of the available power supply voltages to craft a v2 input with the same Thevenin equivalent as the answer to Part 1.