xv$\backslash "18.$ Home$-$Base, a home improvement and building supply chain, is going to build a new warehouse facility to serve its stores in six North Carolina cities$$Charlotte$,$ Winston$-$Salem, Greensboro, Durham, Raleigh, and Wilmington. The coordinates of these cities $($in miles$),$ using Columbia, South Carolina, as the graphical origin $(0,0),$ and the annual truckload trips that supply each store are as follows:"