The length of two sides of a right triangle is 12 inches and 15 inches what is the difference between the two possible length of the third side of the triangle round your answer to the nearest 10th

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.