Use the graph of the quadratic, g(x) to answer each question plz help

Combine like terms to make a simpler expression 3z+z

Ineed with math stuff it involves graphs

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.