During what ten-year period did the average age increase the most? a From 1970 to 1980
b. From 1980 to 1990
c. From 1910 to 1920
d. From 1940 to 1950

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 *_*