can a function be a decimal?

Question

{(0, 0.5), (0.5, 1), (3, 1), (1, 6), (3, 2)}

A) (0.5, 1) and (0, 0.5); A function cannot contain decimals.
B) (0.5, 1), (3, 1); The same y-value has different x-values.
Eliminate
C) (3, 1) and (3, 2); The same x-value has different y-values.
D) (3, 1) and (3, 2); The x-value in a function cannot be greater than the y-value.

Answer 1

The domain and the range of a function can be any real number. That includes fractions and decimals.