What are the answers for the last two questions?

Please explain how you got your answers.

Which statement describes the term economics? a. it is the study of using limited resources to fulfill wants and needs. b. it is the study of how governments fulfill the wants and needs of nations. c. it is the study of how people spend their money to fulfill wants and needs.

In the diagram of circle o, what is the measure of zabc?

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?