For positive constants A and B, the force between two atoms in a molecule is given f(r)=\frac{-A}{r^{2}}+\frac{B}{r^{3}}, \text { where } r>0 Is the distance between the atoms. Note: A

and B are upper case letters. (a) Find f'(r) - __________. (b) Find the critical point for f(r). ____ (c) Classify the critical point as a minimum, maximum, or neither. O minimum O maximum O neither (d) Find the Inflection point for f(r). ______.

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