Answers edited by Ahmet C

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• How do you divide #(x^3+3x^2-2x+5) div(x+1)# and identify any restrictions on the variable?
  
• How do you write electron configurations?
  
• How do you simplify #(2sqrt7+4)^2#?
  
• What is #6div2(1+2)#?
  
• How can the atomic mass be a decimal?
  
• What does electron configuration tell you about an element?
  
• How do you simplify #(-5a^2b^7)^7#?