What are the appropriate constraints for this scenario?

An entrepreneurial resident of the Oklahoma City metropolitan area is interested in securing a new franchise for Mad Over Donuts. Ideally this franchise would be centrally located so delivery could be economically handled and all citizens could enjoy fresh, delicious donuts delivered to the doorstep. The main cities and anticipated demand (in thousands per day) are shown in the table.

City x-coord y-coord Demand
Jones 6 28 45
Luther 13 35 56
Harrah 12 22 30
Edmond 0 32 25
Norman 2 0 33
Moore 3 8 22

Answer: There are no constraints for this model. It is a nonlinear unconstrained optimization problem.