Incomplete assignments count as a zero in the final grade in the eLearning grade book. However, you can manually calculate an overall grade by averaging the grades of the quarterly exams that were completed, then add 5-10% as credit for other assignments.
For example if the average exam grade is 80, you could add 8 points (10% of the exam average) for a final grade of 88.
For more detailed information on grades and grading, see the Teacher's Guide and watch How to Monitor Student Progress (linked on the Teacher Guide and the eLearning Course Home page).