Answer:
a. Supplies Expense $3,700Supplies $3,700
Explanation:
The entries required when supplies are purchased is
Debit Supplies account
Credit cash/accounts payable
At the point of use of these supplies, the entries required are
Debit  Supplies expense account
Credit supplies account
Hence the supplies used
= $5,000 - $1,300
= $3,700
Entries to be posted to adjust
Debit  Supplies expense account  $3,700
Credit supplies account    $3,700