4318230 can you help me?

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).

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.