how do u calculate these? within excel

Melody Leigh, owner of Broadway Floral, operates a local chain of floral shops. Each shop has its own delivery van. Instead of charging a flat delivery fee, Leigh wants to set the delivery fee based on the distance driven to deliver the flowers Leigh wants to separate the fixed and variable portions of her van operating costs so that she has a better idea of how delivery distance affects these costs. She has the following data from the past seven months: Van Operating Month Miles Driven January Februar March April May June July Costs 15,500 17,400 15,400 16,300 16,500 15,200 14,400 $5,390 $5,280 $4,960 $5,340 $5,450 $5,230 $4,680