Which table represents a linear function ? ( show work )

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Evan walked 5/8 mile to his friends house. then together they walked 7/12 mile to the movie theatre. which pair of fraction can evan use to find how far he walked in all?