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balanced equation

What is the range for 31,39,29,34,37,24,36,33,34,28

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 ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827