I need help with this homework

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

Can someone explain to me how to do