Water: [H+] = 0.0000007
pH =
Blood: [H+] = 0.00000004
pH =
Vinegar: [H+] = 0.0063
pH =
DONE

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 *_*