Ok. This works for me:
=IF([Estimated Days to Completion]@row > 10, "Green", IF([Estimated Days to Completion]@row <= 10, "Yellow"))
I can't get these to work:
Estimated Days to Completion is less than or equal to 0 and Status is not closed, should have red dot.
Estimated Days to Completion is less than or equal to 10 and greater than 0, should have yellow dot.
Status contains "On Hold" should have gray dot