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Step-by-step explanation:

A:

(6x + 4)*(2x + 11)

12x^2+8x+66x+44

12x^2+74x+44

B:

a second degree polynomial

C:

The closure property for polynomials can be demonstrated here if you put in some # like a whole number and get an answer that is whole too:

(6x + 4)*(2x + 11)=12x^2+74x+44

if x=0

(6*0 + 4)*(2*0 + 11)=12*0^2+74*0+44

4*11=12*0+0+44

44=44

both 0 and 44 are whole numbers, hence proving the closure property