Question

Do the Math Scientists estimate that Earth is 4.54 billion years old. Chemical evidence of life appears in the fossil record 3.8 billion years ago. What percentage of Earth's history was without life? Write a formula for the calculation using variables you define. Then use your formula to find the answer

Answer 1

%TwL=
`(yE-yL)/(yE) *100`; %TwL=
`(4.54*10^(9) years-3.8*10^(9)years )/(4.54*10^(9)years) *100 = 16.3`%

Step-by-step explanation:

The formula represents the percent of time that the earth was without life, it takes the age of the earth, minus the estimated time for the appearing of life, which is the amount of time the earth was without life, and then divides it by the age of the earth, finally multiplies the result by 100, to give the result as a percentage.

The variables are explained below:

%TwL=percentage of earth´s history without life.

yL=estimated timeframe for the appearing of life in years,

yE=estimated age of the earth in years

applying the formula:

%TwL=
`(4.54*10^(9) years-3.8*10^(9)years )/(4.54*10^(9)years) *100 = 16.3`%