Final answer:
The square root of 66 is estimated to be between 8 and 9, closer to 8. The best representation on the number line from the given options is 8.1.
Step-by-step explanation:
The question asks which point on the number line best represents V66. To find this value, we need to calculate the square root of 66. While the square root of 66 is not a perfect square, and thus doesn't have an integer square root, we can estimate it.
Knowing that 8^2 = 64 and 9^2 = 81, the square root of 66 must be between 8 and 9. By approximation, the square root of 66 is closer to 8 than 9, since 66 is closer to 64 than it is to 81. Thus, the best estimate from the given options would be 8.1 (Option D), as it is closer to 8 than the other available options.