15 is in one box. Below it are 2 boxes. N is in both. Two times a number is 15. What is the number? The variable, n, represents . The bar diagram demonstrates that two of the unknown numbers together make . 2 × = 15. The number is .

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.

Ithink the answer is d