There are 1000 meters in a kilometer, so 5.7 km = 5700 m.
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Multiplying yields 5.7 x 104 = 592.8 meters. This equals 0.5928 kilometers. (A kilometer is 1000 meters.) I believe this question is meant to be scientific notation. 5.7x104 metres is 5.7x101 kilometres, or 57km
10000 equals 10000 meters
"Radius equals 0.9 meters" is not a question.
No, 2 meters equals 20 decimeters
3000 milimeters equals 3 meters.