Read the situations below and determine which relationship is not functional.

Question

Situation 1: a cell phone bill to the amount of minutes used

Situation 2: the perimeter of a square to the length of one of the sides of a square

Situation 3: the total amount of money charged monthly on credit cards to the number of credit cards owned

Situation
does not represent a function.
This is because
.

Answer 1

Situation 3 does not represent a function.

This is because the total amount of money charged monthly on credit cards could vary widely depending on the spending habits associated with each individual credit card, and multiple credit cards can have different usage patterns that don’t correlate directly to just the number of credit cards owned. Therefore, it is possible to have the same total amount charged with varying counts of credit cards, which violates the definition of a function where each input should map to a single output.