If the wave shown in the figure below travels to the left with a speed of 8 m/s,what is its frequency? 
Definitions:
Retail Price
The total cost at which a product or service is sold to the end consumer, inclusive of all markups.
US Dollar
The official currency of the United States, widely used as a standard of exchange in international markets.
Euro
The official currency of nineteen of the twenty-seven European Union countries, known collectively as the Eurozone.
Revenue
The total amount of income generated by the sale of goods or services related to a company's primary operations.
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