Answers created by Batchenov

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• Is every natural number positive?
  
• What is the loss of soil fertility?
  
• How does water affect earth surface?
  
• How do energy sources affect our environment?
  
• What are some examples of nonrenewable energy resources?
  
• How do you evaluate (d+1)(d-1+6) d=2?
  
• How do you define a variable and write an algebraic expression for the phrase: The difference of 8 and a number?
  
• How do you write an algebraic expression for the phrase: a number added to thirty-six?
  
• How do you simplify #2+2(x-7)^2# for x=9?