Answers edited by Ori Kiko

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