Sid had a collection of baseball cards. one day he decided to give half of them to his brother seth. then he gave one third of what was left to his friend bret. then he gave half of what he had left to his friend kevin. now did has 50 baseball cards. how many cards did he have to start with

1. bobby replied ''the monkeys are my favorite.''

2. ''the zoo is very interesting'' replied mrs. weaver ''and we will learn a lot.''

3. mrs. weaver exclaimed ''we will see all the exciting animals in their natural habitat.''

4. true

5. false

- "the basic difference between keywords and subjects is that subjects (or "subject headings") have been predetermined, while keywords have not. a keyword is an easy place to start because you can use any word that seems to fit your search; this is called "natural language" searching."