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Scientific Notation

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  A human heart beats approximately 72 times each minute. Which of these is closest to the number of times the human heart beats in one day?

  
  

  

  

  

  

  
  
  

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  What is the product below expressed in scientific notation? (2.1 × 10³)(3 × 10⁶)

  
  

  6.3 × 10³

  6.3 × 10⁶

  6.3 × 10⁹

  6.3 × 10¹⁸

  
  
  

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