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 11 billion years? b. how far from the end of the timeline does written human history begin?

A- The distance that represents 11 billion years is 244.4 meters.

B- Written human history begins 0.2 milimeters far from the end of the timeline.

Step-by-step explanation:

A- We can solve this problem by using crossed multiplication.

4,5 billion years --- 100 meters

11 billion years --- X

11 x 100 / 4,5 = X

X= 244.4

B- Once again, this can be solved using crossed multiplication.

If 4,500,000,000 years are represented in 100 meters, that would be:

4,500,000,000 --- 100 meters

10,000 --- X

10,000 x 100 / 4,500,000,000 = X

X= 0.0002 meters

0.0002 meters are 0.2 milimeters

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !