The definition of is about the foreign exchange quotes that show the number of foreign currency units per u. s. dollar.

American Currency Quotation

Explanation: The American currency quotation is a foreign exchange quote stating the amount U.S dollar(s) required to purchase a unit of a particular foreign currency.

For Instance, An American currency quote which says $0.00277 = 1NGN

This simply means 0.00277 is required to purchase 1 unit of Nigerian Naira. The quote above involves U.S dollar/Naira currency pair.

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two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.