Strontium- 
has a half-life of 
days. A sample has a mass of 
mg initially. Find a formula for the mass remaining after 
days.
Definitions:
Yen
The official currency of Japan, known internationally by its symbol ¥ and used extensively both domestically and in international finance.
Trade Surplus
A situation where the value of a country's exports exceeds the value of its imports.
Exchange Rate
The value of one currency for the purpose of conversion to another, indicating how much one currency is worth in terms of another.
U.S. Goods
Products and commodities that are produced, manufactured, or grown within the United States.
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