According to modern science, Earth is about 4.5 billion years old and written hu

Question

According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose the entire history of Earth is represented with a 1000-meter-ong timeline, with the birth of Earth on one end and today at the other end. What distance represents 3 billion years? How far from the end of the timeline does written human history begin? 3 billion years is represented by 666.7 meters of the timeline (Type an integer or decimal rounded to the nearest tenth as needed) Witten human history begins about 2.22 millimeters from the end of the timeline (Type an integer or decimal rounded to the nearest hundredth as needed)

Explanation / Answer

In a 1000m stick, point 0 represents 0 years and point 1000m represents 4.5 billion years

a) Distance represented by 3 billion years

=> 3/4.5 * 1000m

=> 666.66

Try the answer as 666.6 and 667

b)

Written human body begins = 10000/(4.5 billion) * 1000 = 2.22 mm

Try tne answer as 2.2

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