exam Maths Puzzle Numerical Ability

What is the sum of (3.1x^2-3.2x-5.2), (7.7x^2-3.2x+16.5), and (x^2+7.9x+8.7)?

Answer Choices:

A) 4.6x^2+17.3x+30.4
B) 11.8x^2+10.9x+20
C) 11.8x^2+17.3x+20
D) 10.8x^2+10.9x

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exam Other Question

{5/x+2}-3/-x-2}
Simplify Divide. Use synthetic division if possible
(8x^4+5x^3+4x^2-x+7)/(x+1)
(12x^3+31x^2-17x-6)/(x+3)

i need some major help with these 2 questions. i was given 110 questions, i need some help with these 2=/