Need help with this quiz asap due by today

Having a hard time understanding this question (see attachment).

Liz is shipping a package to her friend. the maximum weight of a medium flat-rate box is 20 pounds, including the box which weighs 6 ounces. write and solve an inequality to describe the possible weight in pounds, w, of the contents that liz will ship to her friend if she must use a medium flat-rate box. use the drop-down menus to explain your answer.

Rewrite so the subject can be y in the formula d=m-y/y+n