Is it a function?

Front

Is the assignment of the members of a football team to jersey numbers a function?

Back

yes

Front

Is the assignment of zip codes to residences a function?

Back

no

Front

Is the assignment of residences to zip codes a function?

Back

yes

Front

Is the assignment of U.S. citizens to Social Security numbers a function?

Back

yes

Front

Is the assignment of students to locker numbers a function?

Back

yes

Front

Is the assignment of freshman students to English teachers an example of a function?

Back

yes

Front

Is the assignment of English teachers to freshman students an example of a function?

Back

no

Front

Is the assignment of students to their student number a function?

Back

yes

Front

Is a vending machine an example of a function machine?

Back

yes

Front

Is the assignment of students to their home school a function?

Back

yes