Final answer:
To keep the table of values as a function, options B and C can be added.
Step-by-step explanation:
In order to keep the table of values as a function, we need to ensure that each input (time) has only one corresponding output (cost). Let's look at the options:
- A) (25, 1): This option has the same input value as the first entry in the table, so it cannot be added.
- B) (2, 45): This option has a different input value than any entry in the table, so it can be added to keep it a function.
- C) (3, 55): This option has a different input value than any entry in the table, so it can be added to keep it a function.
- D) (4, 50): This option has the same input value as the last entry in the table, so it cannot be added.
Therefore, options B and C can be added to the table of values to keep it a function.