The correct number from the options to describe the length of this metal bar is 15 cm or fifteen centimeters.
The most common units to measure length include:
The unit that should be used is centimeters, considering a rule usually contains centimeters, and this is the unit provided in the image.
Moreover, based on the rule it can be determined the length is 15 centimeters. Other numbers such as 15.0 or 15.000 are innaccurate as there is not need to add more figures in this case.
Note: This question is incomplete because the image is missing. Here is the image
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