Do #3 for me, i don't know what i'm doing.
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Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.
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Why is it that 85.48 rounded to two significant figures is 85 and not 86?
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