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Math·Problem-Solving and Data Analysis·Ratios, rates, proportional relationships, and units

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The bone mineral density of a certain person’s thoracic spine was estimated to be $0.812$ grams per square centimeter. What is this estimated bone mineral density in grams per square millimeter? ($1\text{ centimeter}=10\text{ millimeters}$)

A

$81.2$

B

$8.12$

C

$0.0812$

D

$0.00812$