Mark has $3.50 more than Ryan, and Nate has $9.00 less than Mark. Together, they have a total of $40.00. Use a tape diagram to help build an equation that determines the amount of money each person has.

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.