What dose density mean? i looked it up but i got nothing.

It is the degree of compactness of a substance. Is measured as:

Mass/Volume = Density

Hope this helps!

Density means a degree of a compact substance.
 
So Mass/Volume equals density 

Hope that really explains the answer.

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 *_*