A bone contains 12.5% of the carbon-14 it began with. how old is the bone?

First, we need to know the half life of carbon-14, which is approximately 5,717 years.

A half life is how much time it takes for the sample to decay to half of its original amount. So in 5,717 years, a 1 gram sample of carbon-14 would decay to 0.5 grams.

Similarly, if we start with 100% of a sample , we can keep dividing this number by 2 until we reach 12.5% to find out how many half lives passed.

Remember, when the sample is still 100%, 0 half lives have passed.

% remaining: 100 > 50 > 25 > 12.5

Half lives: 0123

3 half lives passed.

Multiply the half life of carbon-14 (5,717 years) by how many half lives passed.

5

,

717

⋅

3

=

17

,

151

Explanation:

before there were tanks, machine guns, windmills, and solar panels, the first civilizations emerged that create the history of humanity which provided the larger context for western civilization. uses of weaponry and technology were used very differently in the ancient civilizations than they are today. relating back to the times of the ancient mesopotamian civilization, technology kept advancing throughout the ancient egyptian civilization into the ancient greek civilization, and then finally the ancient roman civilization. as techniques and strategies were past down from civilization to civilization, each shared its own similarities, as well as varied differences. one trait they had in common was to commit violence and economically overpower one another. technology has ultimately advanced due to the knowledge transferred from generation to generation. uses of sophisticated weaponry and devices have created more opportunity for warfare and improvement in the work place. ancient civilizations became more powerful due to the advancements of technology. technology did not only create the use of violence, but it also the economies grow and become stronger, because production of trading goods rose like never before. the rivers, such as the nile, tigris, and euphrates all flourished, as well as destructed civilizations. each civilization had different uses for these rivers, however, some benefited more than others. when analyzing ancient civilizations, there   are things you must understand

explanation:

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