Using complements (with respect to 1) of the single discounts , find the net cost equivalent for the discount 15/30 using complements (with respect to 1) of the single diacounts, find the net cost equivalent for the discount 40/10/5​

Fred and gene are hang gliding. fred is 700 feet above the ground and descending at 15 ft/s. gene is decending as shown in the table. interpret the rates of change and initial values of the linear functions in terms of the situations they model. show all work. freds equation is f(x)=-15x+700. ( genes is the table attached)