Can someone please take time out of their day and help me with this

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.

Are triangles the congruent? write the congruency statement. what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?