I need a and b answered with b answer in exact answer format. According to moder

Question

I need a and b answered with b answer in exact answer format.

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

100-meter-long

timeline, with the birth of Earth on one end and today at the other end.a. What distance represents

4

billion years?

b. How far from the end of the timeline does written human history begin?

a.

4

billion years is represented by

nothing

meters

of the timeline.

(Type an integer or decimal rounded to the nearest tenth as needed.)

Explanation / Answer

Acc to question,

100 meter long line represents 4.5 billion years.

(a) So, 1 year is at a distance of 100/(4.5 billion) meter

So, 4 billion years is at a distance of (4 billion)*(100/(4.5 billion)) meter

= 400/4.5

= 88.9 meters(rounded to nearest tenth)

(b) human history is 10000 years old.

So, it is represented by 10000* (100/ 4.5 billion)= 1000000/4500000000= 1/4500 from the end of timeline

= 0.000222 meters

= 0 meters (rounded to nearest tenth)

Please upvote . Thank you.

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