6. Geologists estimate that Earth is approximately four billion, five hundred seventy million years old. Write this number in figures. 7. The population of China was one billion, three hundred and thirty nine million, seven hundred and twenty four thousand, eight hundred and fifty two according to the 2010 census. Write the number in figures. s. If the Earth is 149597888 km from the sun and Mars is 227939100 km from the sun, what is the difference in the distance from the sun between the Earth

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**6. Geologists estimate that Earth is approximately four billion, five hundred seventy million years old. Write this number in figures.**

**Answer:**  
4,570,000,000 years

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**7. The population of China was one billion, three hundred and thirty-nine million, seven hundred and twenty-four thousand, eight hundred and fifty-two according to the 2010 census. Write the number in figures.**

**Answer:**  
1,339,724,852

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**8. If the Earth is 149,597,888 km from the sun and Mars is 227,939,100 km from the sun, what is the difference in the distance from the sun between the Earth and Mars?**

**Answer:**  
To find the difference in distance between Earth and Mars from the sun:

$$ \text{Difference} = \text{Distance of Mars} - \text{Distance of Earth} $$

$$ \text{Difference} = 227,939,100 \, \text{km} - 149,597,888 \, \text{km} $$

$$ \text{Difference} = 78,341,212 \, \text{km} $$

**So, the difference is 78,341,212 kilometers.**

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**6.** 4,570,000,000 years **7.** 1,339,724,852 **8.** The difference is 78,341,212 kilometers.

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