How do i round off 7.2+12.07+9.49 to the nearest whole number

Well, begin by adding all your numbers.
Which should give you 28.76.
Then we round, 29.00.

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 *_*