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The half-life of iron-59 is 45 days. After three months, how much of a 72-gram sample of iron-59 is left?
Economics
The social science concerned with the production, distribution, and consumption of goods and services.
Sociology
The study of the development, structure, and functioning of human society.
Time
A dimension in which events can occur in sequence from the past through the present to the future, also a critical element in economic models affecting production, consumption, and investments.
Economics
The social science that studies how individuals, governments, and nations make choices on allocating resources to satisfy their wants and needs.
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