Find the functions 
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Definitions:
Flexible Exchange Rates
A system in which the worth of a currency is permitted to vary based on the foreign exchange market, free from direct governmental interference.
Economic Growth
An increase in the amount of goods and services produced per head of the population over a period of time, typically seen as an indicator of the economic health of a country.
Japanese Yen
The official currency of Japan, represented symbolically as ¥ and known as one of the major currencies traded in the world.
South Korean Won
The official currency of South Korea, symbolized as KRW.
Q34: Find an equation of the tangent line
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Q90: The volume of a spherical cancerous tumor
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Q231: The consumption function of the U.S. economy
Q238: Find the differential of the function.