Final answer:
0.45 m translates to 4.5 dm, using the metric prefix 'deci-' representing decimeters.
Step-by-step explanation:
The given length is 0.45 m which needs to be expressed using a metric prefix. The closest metric prefix that we can use here is decimetre (dm), where 1 dm is equal to 0.1 m. Therefore, we move the decimal point one place to the right to convert meters to decimeters. Hence, 0.45 m can be expressed as 4.5 dm where the coefficient is greater than or equal to 1 and less than 1000. To express 0.45 m using a metric prefix, we need to find a prefix that represents a value greater than or equal to 1 and less than 1,000. One such prefix is 'kilo-', which represents a multiplier of 1,000. So, 0.45 m can be expressed as 0.45 km
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