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A decimeter (dm) is one tenth of a meter. The diameter of Earth is 1.3 x 104 km. What is the diameter expressed in decimeters?

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A decimeter (dm) is one tenth of a meter. The diameter of Earth is 1.3 x 104 km. What is the diameter expressed in decimeters?

1.3 × 10–5 dm

1.3 × 1011 dm

1.3 × 108 dm

1.3 × 107 dm

Guest Aug 16, 2017
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$$A\ decimeter\ (dm)\ is\ one\ tenth\ of\ a\ meter.\\ The\ diameter\ of\ Earth\ is\ 1.3 \times 10^4 km.\\ What\ is\ the\ diameter\ expressed\ in\ decimeters?$$

$$1.3 × 10^{–5} dm\\ 1.3 × 10^{11} dm\\ \color{blue}1.3 × 10^8 dm\\ 1.3 × 10^7 dm$$

$$The\ diameter\ of\ Earth\ is\ 1.3 \times 10^4\ km\times\frac{10^4dm}{km}=1.3\times10^8\ dm$$

!

asinus  Aug 16, 2017