Answers edited by Sarah

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• What normally happens after a mass extinction?
  
• What is the percent decrease from 20 to 11?
  
• How do you simplify #7+2 (4x - 3)#?
  
• How do you find square root of 3 to the 4th power?
  
• What business did Andrew Carnegie dominate?
  
• When did the fire break out at the Triangle Shirtwaist Factory?