Could I get full in depth explanation for each answer.

5) State and explain why each of the following statements is, or is not, legitimate. a) Five objects, all of which are spheres of the same material, must have the same mass and volume since they have the same density. b) If a polygon has a large perimeter, then it will have a large area. (c) If the graph of two quantities is a curve with a negative slope, then the graph is directly functionally related to the curve