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The first table since input is x 10 -18 = -8 5-18=-13 and 0-18=-18 are all right

It would be the first answer choice because if you subtract 18 from each number (x) it would come out to be the other number (y) 

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*