Answers edited by Ori Kiko

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• How many moles of gas are in a 4.5 meter cylinder at 105K with a pressure of 2.0atm?
  
• How do you solve #\frac { 18} { x - 2} - \frac { 4} { x - 1} = \frac { 4} { x ^ { 2} - 3x + 2}#?
  
• Question #1427c
  
• Is #f(x) =sqrt((x-12)(-x+3))-x^2# concave or convex at #x=6#?
  
• Which quadrants and axes does #f(x)=x-sqrt(x+5)# pass through?