Please help I am not sure why it's partially wrong.

On April 1, Michelle Walker established Walkers Travel Agency. The following transactions were completed during the month.

1.		Invested $15,000 cash to start the agency.
2.		Paid $500 cash for April office rent.
3.		Purchased equipment for $3,600 cash.
4.		Incurred $600 of advertising costs in the Chicago Tribune, on account.
5.		Paid $500 cash for office supplies.
6.		Performed services worth $10,000: $2,800 cash is received from customers, and the balance of $7,200 is billed to customers on account.
7.		Withdrew $600 cash for personal use.
8.		Paid Chicago Tribune $400 of the amount due in transaction (4).
9.		Paid employees' salaries $2,800.
10.		Received $4,200 in cash from customers who have previously been billed in transaction (6).

Your answer is partially correct. Complete the tabular analysis of the transactions. (If a transaction results in a decrease in Assets, Liabilities or Owner's Equity, place a negative sign (or parentheses) in front of the amount entered for the particular Asset, Liability or Equity item that was reduced. See Illustration 1-8 for example.) WALKER'S TRAVEL AGENCY Assets Liabilities Accounts Receivable Accounts Payable Owner's Capital Cash Supplies Equipment 1. $ 15,000 $ i $ i i $ i $ 15,000 2. -500 i i i i 3. -3,600 i i 3,600 4. i i 600 5. -500 i 500 i i i 6. 2,800 7,200 i i i 7. -600 i i 8. -400 i i i -400 i 9. -2,800 i i 10. 4,200 -4,200 i i i 13,600 $ 3,000 $ 500 3,600 $ 200 A 15.000 A A Owner's Equity Owner's Drawings + Revenues - Expenses $ $ i i 500 i i i 600 i 10,000 600 i i i 2,800 i $ 600 $ 10,000 $ 3,900