Answers edited by ProfLayton

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• How do you evaluate `sin((5pi)/9)cos((7pi)/18)-cos((5pi)/9)sin((7pi)/18)`?
  
• Solve question 39 ?
  
• How do you factor `-9r^2 + 81`?
  
• Question #e61aa
  
• Solve question 39 ?
  
• Question #85f61
  
• What is the axis of symmetry and vertex for the graph `y=2x^2+4x-3`?
  
• Question #5b977
  
• Question #e61aa
  
• What is the equation of the line that passes through `(-1,2)` and is perpendicular to the line that passes through the following points: `(5,-3),(7,6)`?