I need help answering a couple questions from Succeeding in Business Microsoft Access 2013

What is the difference between the Number and Currency data types, and how would you use each one? Name and describe the Calculated data type available in Access 2013. Give an example, not already described in the book, of when you could use this data type. Why and when should you use the Lookup data type? Give two specific examples not described in the book. What are three general rules about naming objects in a database? What are the four main database objects, and how is each one used