Mathematics: The earth is 4.6 billion years old, but human civilization (the building of cities) began only about 10,000 years ago. if you represent the history of earth with a line one mile long (63,360 inches), how long must the line be to represent the history of human civilization?

The earth is 4.6 billion years old, but human civilization

Hockeypro1127

30.05.2020

0.13774 inches ( approx ).

Step-by-step explanation:

Given,

The age of earth = 4.6 billion years = 4600000000 years,

The represented age of earth = 63,360 inches,

That is, scale factor in representation of age

$=\frac{\text{Represented age}}{\text{Actual age}}$

$=\frac{ 63,360}{4600000000}$

Now, the age of human civilization = 10000 years,

Thus, the represented age of human civilization = actual age × scale factor

$=10000\times \frac{ 63,360}{4600000000}$

$=\frac{633600000}{4600000000}$

=0.137739130435

$\approx 0.13774\text{ inches}$

0,0(0 оценок)