Answers edited by Jamen N.

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• How do you round 3,779 to the nearest hundred?
  
• How do you simplify #\frac { \frac { 1} { 5} - \frac { 1} { a } } { \frac { a - 5} { a } }#?
  
• How do you graph #y=x^2 - 2x - 1 #?
  
• People who violated human rights?