What is the inverse of the following function?

In two or more complete sentences describe how to determine the appropriate model for the set of data, (1,1), (3,2), (6,3), (11,4).

Kerion has a beaded necklace business. she can make 12 necklaces is 2 hours. how long will it take her to make 9 necklaces?

If the tip varies directly with the number of guest which equation represents between the tip,t, and the number of guest,g?