1. Unless there is a unit right after the number (like 7000 lbs), then there would be 4 significant figures.
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There are 7000 mm in 700 cm.
Answer: 7000 km/h = 4,349.6 mph
There are 10 decimeters in one metre. Therefore, 7000 decimetres is equal to 7000/10 = 700 metres.
There are 10 millimetres in one centimetre. Therefore, 7000 millimetres is equal to 7000/10 = 700 centimetres.