please answer both parts a and b! According to modern science, Earth is about 4.

Question

please answer both parts a and b!

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-long

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

3

billion years?

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

a.

3

billion years is represented by

nothing

meters

of the timeline.

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

Explanation / Answer

(a)

4.5 billion years are represented by 1000 m

so 4.5 billlion years = 1000m

1 year = 1000m/4.5 years

3 billion years = 1000m/4.5 years*3 years = 666.7 m

(b)

since 4.5 billion is at 1000 m

so 4.5*10^9 - 10^5 will be at = (1000) * (4.5*10^9 - 10^5) / (4.5*10^9) = 999.9 m

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.