What are the four elements of a valid contract (attachment)

1. What are the four elements of a valid contract?

2. Describe the objective theory of contracts. How does that theory apply to this case?

3. Why do you think the court held that there was not a valid agreement here?

4. Are advertisements generally considered offers? Why or Why not?

5. How does this case differ from a reward situation, where a unilateral contract is formed upon completion of the requested act?