Awelder earns $20 an hour for the first 40 hours she works in a week and $30 for every hour over 40 hours. determine a piece wise function f(x) that can be used to determine the welder's earnings when she works for x hours in a week

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.