Prepare the Required End-Of-Period Adjusting Entries for Each Independent Case

Prepare the required end-of-period adjusting entries for each independent case listed below.
Case 1:
Thomas Ltd began the year with a $3,000 balance in the Office supplies account. During the year, $8,500 worth of additional office supplies was purchased. A physical count of office supplies on hand at the end of the year revealed that $6,400 worth of office supplies had been used during the year. No adjusting entry has been made.
Case 2:
Carson Ltd has a calendar year-end accounting period. On 1 July, the company purchased office equipment for $28,800. It is estimated that the office equipment will depreciate $400 each month. No adjusting entry has been made.
Case 3:
Yates Realty is in the business of renting several apartment buildings and prepares monthly financial statements. It has been determined that 3 tenants in $600 per month apartments and one tenant in the $1,000 per month apartment had not paid their December rent as of 31 December.