maddieboyd630
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According to modern science, Earth is 4.5 billion years old and written human history extends about 10,000 years back. Suppose the entire history of earth is represented with a 1000 meter long timeline, with the birth of earth on one end and today on the other. What distance represents 4 billion years? How far from the end of the time line does written human history begin?

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sqdancefan

Answer:

  1. 888 8/9 meters
  2. 2 2/9 millimeters

Step-by-step explanation:

Length is proportional to time, so ...

1. (4 billion)/(4.5 billion) = L/(1000 meters)

... L = (1000 meters)×4/4.5 = 888 8/9 meters

2. Using the same idea as in problem 1, the length is ...

... L = (1000 meters)×(10^4)/(4.5×10^9) = (2 2/9)×10^-3 meters = 2 2/9 mm

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