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For cylinders to be similar, the ratio between their height and radius must be equal.Our cylinder's ratio is :


The only cylinder with same ratio is the one at the choice B.

 

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 *_*