### Your Turn

9.2

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1.

Yes. The unit of value, cm

^{2}, is appropriate given the size of a sheet of paper. Because the total area of 2,412.89 cm^{2}represents four sheets of paper, each sheet is approximately 600 cm^{2}, which seems reasonable for a sheet of letter-size paper.
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9.21

1.

Yes. The unit of value, mm

^{3}, may be appropriate given the size of the paperweight. The volume of 125,000 mm^{3}is equivalent to a volume of 125 cm^{3}, which would represent a cubic box with dimensions of 5\,{\text{cm}}\times 5\,{\text{cm}}\, \times 5\,{\text{cm}}.
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9.33

1.

A reasonable value for the weight of an Etruscan shrew is 2 g. A 2 L bottle of water weighs 2 kg, and since it is one of the smallest mammals, the shrew must weigh less than that, so 2 g seems reasonable.

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9.43

1.

Recall that water boils at 100 Â°C. The more reasonable value for the temperature of the mixture is 148 Â°C. So, 48 Â°C is not sufficient to bring the mixture to a boil.

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9.48