exam Maths Puzzle Numerical Ability

i have to find out when i answer this question is i have to round it to the nearest ten. heres the question if a=4 anb b=4 wat is c=? and one more question if b=7 and c=10 wat does a=? thank you for answering my questions.

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Please help me solve this equation:
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(6+3x+9x2+8x3)+ (4-3x+9x2-8x3) Thank you for your help.Solving the following by Factoring the equations of x^2-6x-16=0, would (x+2)(x-8)=0 or -8x+2x, and would the same apply to 6x^2+42x=0,6x(x+7). Is x2 the same as x^2. This site has truly been a big help for me.