Which equation models the height, y, x seconds after firing?

What is the y-intercept of the line given by the equation

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

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.