Does this graph represent a function? Why or why not?

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Aplane is taking off from bangladesh headed to new york city. at the same time, a plane from new york city is headed to bangladesh is also taking off. the plane bound to new york city is traveling at 600 mph, while the plane traveling to bangladesh is traveling at 400 mph. how far from new york city will the two planes meet if the distance between new york city and bangladesh is 8,000 miles?

Which statement best explains why ben uses the width hi to create the arc at j from point k