Answer:
Bad debt expense $5.125
Step-by-step explanation:
Initial Balance 
Accounts Receivable $ 43.000 
Allowance for Uncollectible Accounts $ 1.250 
Entry 
Allowance for Uncollectible Accounts $ 775 
Accounts Receivable $ 775 
New Balance 
Accounts Receivable $ 42.225 
Allowance for Uncollectible Accounts $ 475 
Entry Adjustment
Bad debt expense $ 5.125 
Allowance for Uncollectible Accounts $ 5.125 
END Balance 
Accounts Receivable $ 42.225 
Allowance for Uncollectible Accounts $ 5.600