Answers edited by Erudite

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• How do you solve #-2(x-4)=15#?
  
• How do you simplify square root of 8 - the square root of 66?
  
• Question #fdeca
  
• How do you solve the simultaneous equations #7a - 3b = 17 # and #2a + b = 16#?
  
• How do you write 14.05 billion in scientific notation?
  
• How do you convert 315 degrees into radians?
  
• How do you simplify 4 sq.root of 75 + sq.root of 27.?
  
• How do find the vertex and axis of symmetry, and intercepts for a quadratic equation #f(x) = -x^2 + 10#?