Solution and explanantion
Answer for Q7 - Debit balance of $1,370 
Cash has a debit normal balance. 
Practically speaking the cash balance will be credit only if cash is negative which can never happen. 
Answer for Q8 - Credit balance of $1500 
All equity accounts have credit normal balance except withdrawal or dividend accounts. 
Answer for Q9 - Credit balance of $770 
All liabilities have credit normal balance. 
Answer for Q10 - $5000 
Working 
 Trial balance 
 Debit Credit 
Cash $1,370.00 
Accounts receivable $ 1,600.00 
Office equipment $ 900.00 
Benson withdrawal $ 500.00 
Benson capital $ 1,500.00 
Accounts payable $ 770.00 
Salaries expense $ 630.00 
Service revenue $ 2,730.00 
  $ 5,000.00 $ 5,000.00