Arectangle has sides measuring (2x + 7) units and (5x + 9) units.

part a: what is the expression that represents the area of the rectangle? show your work to receive full credit. (4 points)

part b: what are the degree and classification of the expression obtained in part a? (3 points)

part c: how does part a demonstrate the closure property for polynomials? (3 points)