I am using Excel 2007. When I change the order of the trendline from 2 to 3,
the cubic term does not appear. If I rasie the order to 4 there is still no
cubic term. Only when I raise the order to 5 does the cubic term appear. I
suspect that the higher order terms are not displaying. Any ideas as to why
this is happening?

I have sent the file to people who are using Excel 2003 and they have no
problem getting the trendline equation to display correctly.