1) What are three ways that a set can be written? Use an example and express it in these three ways. There are manypossibilities.

2) In your own words, what is the difference between equal sets and equivalent sets? Give an example of equal sets and an example of equivalent sets. There are several possible answers.

3) What is an empty set (or null set)? What is the cardinal number of the empty set (or null set)? Provide page number(s) from textbook.

4) If a set has 5 elements, how many proper subsets does the set have?