The diagram shows parallelogram ABCD, where AB = DC = x cm and AD = BC = 10 cm. Given that AC = 2x cm and angle BAC = 30°, show that x² = 100(5 +2√3) / 13

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.