How many roots of each of the following polynomials are in the right half of the complex plane?

How many roots of each of the following polynomials are in the right half of the complex plane?

(a) s3 + 2s2 + 3s +4

(c) 0.3s4 + 1.1s3 + 0.7s2 + s + 2.1

(d) s5 + s4 + 2s3 + 3s2 + 1/2

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