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Level 1 8. a. { Counting numbers less than 0} 1. IN YOUR OWN WORDS Why do you think mathematics b. The set of people with pointed ears accepts the word set as an undefined term? 2. IN YOUR OWN WORDS Distinguish between equal and equivalent sets. 3. IN YOUR OWN WORDS a. What is a universal set? b. What is the empty set? 4. IN YOUR OWN WORDS Photos 12 / Alamy a. Give three descriptions of the empty set. b. Give an example of a set with cardinality 0. Tell whether each set in Problems 5-8 is well defined. If it is not Zachary Quinto as Spock well defined, change it so that it is well defined. Specify the sets in Problems 9-14 by roster. 5. a. The set of students attending the University of California 9. a. {Distinct letters in the word mathematics} b. { Grains of sand on earth } b. { Current U.S. president } 6. a. The set of counting numbers between 3 and 4 10. a. {Odd counting numbers less than 11} b. The set of happy people in your country b. { Positive multiples of 3} 7. a. { Good bets on the next race at Hialeah} 11. a. { A | A is a counting number greater than 6} b. { Years that will be bumper years for growing corn in Iowa} b. { B B is a counting number less than 6}