By what percentage should a quantity be multiplied by in order to decrease it by 19.75%?

Multiply by .8025
when doing percents, move decimal points two places to the left to turn it into a decimal
for example, 10% is .1

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 *_*