Answers created by Callum H.

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• Does it matter which coordinate is `(x_1,y_1)` when applying the distance formula?
  
• What is the derivative of `sec^2(x)`?
  
• What is an opportunity cost?
  
• Question #64fc4
  
• How do you find the slope of a demand curve?
  
• What is the derivative of a unit vector?
  
• Question #27931