Final answer:
The expression 1/3 (12-9y) simplifies to 4 - 3y by distributing 1/3 to the terms inside the parentheses. The correct simplified expression is 4 - 3y.
Step-by-step explanation:
We're asked to simplify the expression 1/3 (12-9y). To simplify this expression, we distribute the factor of 1/3 to both terms inside the parentheses.
- Multiply 1/3 by 12 to get 4.
- Multiply 1/3 by -9y to get -3y.
So, the expression simplifies to 4 - 3y.
The correct answer to the question is option a) 4 - 3y.