Final answer:
To write 0.001 as an equivalent repeating decimal, divide 1 by 1000.
Step-by-step explanation:
To write 0.001 as an equivalent repeating decimal, we need to divide 1 by 1000. By doing this division, we get:
0.001 = 1 ÷ 1000 = 0.001001001001...
Therefore, the correct answer is 0.001001001001... (Option O).
Learn more about Converting decimals to repeating decimals