Some one help me with this plz

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.

Which value of c would make he following expression completely factored? 8x+cy

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left