A. Use the roster method to write the given set. You may need to consult a reference, such as the Internet or an encyclopedia. (Enter your answers as a comma-separated list. Enter EMPTY for the empty set.) The set of whole numbers less than 9.
 B. Use set-builder notation to write the following set.
 {1, 4, 9, 16, 25, 36, 49, 64, 81}
 x 
 x 
  x is a positive number less than or equal to 9
 x 
 none of these
 C, State whether the given pair of sets are equal, equivalent, both, or neither.
 {1, 2, 9}; {I, II, IX}
 A. equal
 B. equivalent
 C. both
 D. neither