Someone explain this and what is the answer

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Use set builder notation to represent the following set: { -3, -2, -1, 0}

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).