An equilateral is a 3-sided plygon in which all sides have the same length. write a formula for the perimeter, p, of an equilateral triangle whos perimeter is 72 inches.

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.