 Practice Math Questions for Praxis: Identifying Functions - dummies

# Practice Math Questions for Praxis: Identifying Functions

Can you identify a function? If yes, then you’ll have no problem with function-related questions on the Praxis Core exam. If no, then you may want to brush up on your function-spotting skills, starting with the following practice questions.

## Practice questions

1. Is the relation {(2, 5), (3, 7), (4, 1), (8, 1)} a function?

A. The relation is a function because no element of the range is paired with more than one element of the domain.
B. The relation is a function because no element of the domain is paired with more than one element of the range.
C. The relation is NOT a function because 1 is paired with both 4 and 8.
D. The relation is NOT a function because no element of the domain is paired with more than one element of the range.
E. The relation is NOT a function because 2 is paired only with 5.

2. Does the following mapping represent a function? A. It does represent a function because each number in the domain is paired with at least one number in the range.
B. It does represent a function because each number in the range is paired with at least one number in the domain.
C. It does NOT represent a function because 2 is paired with both 1 and 12.
D. It does NOT represent a function because 5 is paired with both 7 and 10.
E. It does represent a function because no number is listed more than once in the left column.