The earth is 4.6 billion years old, but human civilization (the building of cities) began only about 10,000 years ago. if you represent the history of earth with a line one mile long (63,360 inches), how long must the line be to represent the history of human civilization?

0.13774 inches ( approx ).

Step-by-step explanation:

Given,

The age of earth = 4.6 billion years = 4600000000 years,

The represented age of earth = 63,360 inches,

That is, scale factor in representation of age

Now, the age of human civilization = 10000 years,

Thus, the represented age of human civilization = actual age × scale factor

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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