Need help on this picture ​

Which of the following is not a subset of {1,2,3}?

Combine like terms to make a simpler expression 3z+z

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )