Some organisms use glycerol as a carbon energy source, and it is also an intermediate in fructose

Question:

Some organisms use glycerol as a carbon energy source, and it is also an intermediate in fructose metabolism.
(a) Write equations for the reactions required to oxidize glycerol to pyruvate.
(b) Compare the ATP yield of two molecules of glycerol versus one molecule of glucose in glycolysis.
(c) Does the anaerobic fermentation of glycerol maintain the redox balance of the cell? Explain.