Question

I'd really appreciate if anyone helped! :)

Answer 1

In order for the data set to represent a function, there can be no duplicates of the first value.

A. 1 is used as the first value more than once       it is NOT a function

B. 3 is used as the first value more than once       it is NOT a function

C. no first number is used more than once            it IS a function

D. 3 is used as the first value more than once       it is NOT a function

Answer: C