Answer and Explanation:
The adjusting entries are as follows:
1	Insurance expense Dr	$310
            To Prepaid Insurance  $310
(Being insurance expense is recorded)  
2	Supplies expense Dr $1,650 ($2,610 - $960)
            To Supplies $1,650
(Being supplies expense is recorded)  
3	Depreciation expense Dr $150
            To Accumulated Depreciation - Equipment $150
(Being depreciation expense is recorded)  
4	Unearned service revenue Dr (two-fifth of $12,000) $4,800
            To Service Revenue $4,800
(Being service revenue is recorded)