List the factors pairs of the number 22

Which of these tables represents a non-linear function?

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?