Final answer:
The distributed equivalent to 18x + 9y is 9(2x + y) (option a).
Step-by-step explanation:
The distributed equivalent to 18x + 9y is 9(2x + y) (option a).
To distribute the 9 into the expression, we multiply 9 by each term inside the parentheses. So, 9(2x + y) becomes 9 * 2x + 9 * y, which simplifies to 18x + 9y.
Therefore, the correct answer is a) 9(2x + y).