Christy alter a skirt she cut 7 in of the bottom of the skirt and then adds a 5-inch ruffle to the skirt remaining bottom edge which expression best represents the final length of the skirt

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle