Final answer:
The abbreviation 'dam' stands for decameters. '45 dam' means '45 decameters'. To convert 'dam' to the base SI unit, we multiply by 10, so 45 dam equals 450 meters.
Step-by-step explanation:
The abbreviation 'dam' stands for decameters in the International System of Units (SI). So, '45 dam' essentially means '45 decameters'. However, the most specific base unit in SI for measuring length/distance is the meter (m). So, to convert 'dam' to meters, you would multiply by the conversion factor which for decameters to meters is 10. Therefore, 45 dam equals 450 meters in the SI unit.
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