Final answer:
After assessing all the options provided, the numbers that are correctly ordered from least to greatest are found in option D: -√16, -7, 0.81, 2.
Step-by-step explanation:
To order numbers from least to greatest, first identify the values of the numbers presented, including any radicals or known constants. For option A, there is a typo and the numbers can't be ordered without clarity. For option B, 34, √16, and 211, once simplified, the values are 34, 4 (since √16 is the square root of 16, which is equal to 4), and 211. Option C has a known constant, π (approximately 3.14), and the square root of 3, √3, which is about 1.732. Finally, option D includes √16 again, -7, 2, and 0.81.
Option A is incomplete, and Option C is not presented in a correctly ordered list since -π is less than -√3. The correct order for option B is √16, 34, 211. For option D, taking the square root of 16 gives us 4, so the correct ordered set is -√16 (or -4), -7, 0.81, 2.
Therefore, the correct answer that is ordered from least to greatest is option D: -√16, -7, 0.81, 2.