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Verified answer
a) 3x^2 + 10x + 7 + (16x^2+ 11x +9) = 19x^2 + 21x+ 16b) 17x^3 + 3x^2 +10x+7 - ( 3x^2 +10x +7)= 17x^3
c) 3x^2 + 10x + 7 + (16x^2+ 11x +9) + 17x^3 + 3x^2 +10x+7= 17x^3 + 22x^2 + 31 x + 23
d) 17x^3 + 3x^2 +10x+7 - ( 16x^2+ 11x +9)= 17x^3 - 13 x^2 -x -2