Help please look at picture!!^^

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

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.