Please simplify this problem

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

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.