Final answer:
The question asks which combinations of pins and rings Luke could sell. Only option b (4, 4) is a valid combination.
Step-by-step explanation:
The question asks which of the given combinations of pins and rings that Luke could sell. To determine this, we need to look at the first number in each combination, which represents the number of pins, and the second number, which represents the number of rings.
Option a. (2.5, 5): The first number is not a whole number, so it does not represent a valid quantity of pins. Therefore, this option is not a valid combination.
Option b. (4, 4): Both numbers are whole numbers, so this is a valid combination of 4 pins and 4 rings. Luke could sell this combination.
Option c. (10, 0): The second number is 0, which means there are no rings. Therefore, this option does not represent a valid combination.
Option d. (13, −2): The second number is negative, which does not make sense in this context. Therefore, this option is not a valid combination.