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  Every year green sea turtles swim from Brazil to a faraway island in the south Atlantic Ocean. Let n represent the number of miles in a one-way trip. Which expression shows how many miles green sea turtles swim in a round trip from Brazil to the island and back to Brazil?

  
  

  2  -  n

  2  +  n

  2  ÷  n

  2n

  
  
  

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