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?

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

step-by-step explanation: examine the two-step equation.

−  

7

4

+  

x

4

= 2

which property of operations allows you to add the same constant term to both sides?

multiplication property of equality

division property of equality

addition property of equality

subtraction property of equality

true

step-by-step explanation: