4. Based on your answers to questions 1, 2, and 3 above, what relationships indicate that further investigation might be prudent? Prepare a graph of the items that you consider worthy of further investigation . 5. What does the Unbilled Charges on Restorations account represent? 6. For the three months ending July 31, 1986, there was a zero balance in Unbilled Charges on Restoration, yet there was a balance of $107,301 in Overbilled Charges on Restoration. Is there any significance to this difference? 7 What do you think the Advances on Materials account represents