Final answer:
To apply the associative property to the expression 2 (11 y), you can regroup the numbers as (2 * 11) y, simplifying to 22y, which doesn't change the value of the expression.
Step-by-step explanation:
To write an equivalent expression using the associative property, we look at how the numbers and variables in an expression are grouped. For example, with the expression 2 (11 y), we are multiplying 2 by the result of 11 times y. According to the associative property of multiplication, we could group the 2 with the 11 first, then multiply by y, which doesn't change the product. So, an equivalent expression using the associative property would be (2 * 11) y, which simplifies to 22y.