Answers edited by Joe B.

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• Is #f(x) =(x+4)^3/(x^2/3+1)# concave or convex at #x=8#?
  
• Looking for answers for a)iv), a)v) and c)... Is my brain not working or are the answers in my book wrong? An explained answer is much appreciated!
  
• Using the picture, what DEGREE MEASURE does a + b equal?