In an equilateral triangle, all 3 sides are equal length, and the
perimeter of an equilateral triangle is 3 times the length of one side.
if one side measures 9 + 3x, and the measure of another side is 5x -5,
what is the perimeter of the equilateral triangle?

x=

a length of side =

perimeter of equilateral triangle =

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.