I just need someone to check that I have dont this correctly and explain why its wrong if it is

Adjusting Entries: Assume CASH BASIS is used a. Supplies are purchased on December 1 for $2,000 cash. $1,800 supplies remain 12/1 12/31 Sooe b. The company prepaid 6 month's insurance premiums for $1,500 cash on December 2 12/2 12/310epaid insurance c. Received a $5,400 cash advance on August 1 for a contract to provide services for 1-year. (Assume equal amounts of work are completed each month.) 5uDo va 12/31