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The retaining wall is loaded in axial compression and flexure. For the ASD analysis of the wall in part a, shouldn't we use the more complex calculations for 'k' and the moment capacities that takes into accoount the axial loading? In this case the way they used (ignoring the axial load) was ok...

I think they really screwed up the solutions for these problems. It seems they made the loads from the remaining purlins at 1/4 & 3/4 points disappear when the truss and machine loads were added. Shouldn't the condition to be analyzed in problems a) and b be a combination of Figures 804C...