Am i correct i want to make sure plsss let me know

3(10x-y)-5(x-y^2) need this solved asap

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.

Need on this one asap im almost done with this subject