If an object is 28,650 yrs old,how many C-14 
half-lives have occurred as compared to a living organism?
Definitions:
Proportion
An element, division, or percentage judged in comparison to its complete sum.
Ratio
A mathematical relationship between two numbers showing how many times the first number contains the second.
Exchange Rate
The conversion value of one currency in relation to another.
Net Gain
The difference between the selling price of an asset and its purchase price, after adjusting for costs, taxes, and other expenses.
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