Which of the following transactions require a journal entry?

Customers purchased $10,000 in merchandise on account. No cash was exchanged.
12 employees are hired to work the midnight shift.
Equipment was traded for similar equipment. No cash exchanged hands.
A sign was purchased for the front of the building, but the company didn't have the cash to pay for it immediately.
A truck is purchased for making deliveries. A $6,000 deposit was paid in cash and $30,000 promissory note was signed.
A 5 year lease is signed with the landlord
Rent is paid for the first month of operations.