Need help writing 6 essay questions.

Due 3 hours from now.  Only reply with good reviews, and EC knowledge.

1. Write a short essay that defines the term e-commerce, then describe how companies have utilized this new medium.
2. Describe nonrepudiation and its importance for EC and electronic transactions.
3.  List and describe the four basic types of B2B transactions and activities. 
4. Describe the typical transactions of B2B.
5. Describe the concept of sell-side e-marketplace.
6. Describe the major players in a buy decision.