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the length of a piece of string is known to be exactly 9.84 cm. two students measured the string. student A used a ruler marked in centimeters and got a measurement of 10 cm. student B used a ruler marked in millimeters and centimeters and got a measurement of 9.8 cm. how precise is the ruler originally used to measure the string ? explain

See Drwls' answer from a few hours ago.

http://www.jiskha.com/display.cgi?id=1254493221

Please do not keep posting the same question.

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