Final answer:
Option C (6.4 < 6.51 < 6.387 < 6.995) shows numbers not in order from least to greatest.
Step-by-step explanation:
The list that shows numbers not in order from least to greatest is option C) 6.4 < 6.51 < 6.387 < 6.995.
To determine if a list is not in order from least to greatest, we need to find a pair of numbers where the number on the right is smaller than the number on the left. In option C, 6.51 is smaller than 6.387, which means the list is not in order from least to greatest.
The correct order for the other options are:
A) 4.036 < 4.08 < 4.2 < 4.201
B) 3.09 < 3.1 < 3.607 < 3.9
D) 7.315 < 7.38 < 7.406 < 7.5