Explain how I determined the answer to number three on the assignments a day and give the answer as well. ( give the steps you did to solve it in words and give the final answer awesome)

Question and answers are in the attached picture. you so much in advance.

Acircle has a circumference of 2 pi cm. which statement about the circumference and area is true? a comparison of the area and circumference is not possible since the area cannot be determined. the numerical values of the circumference and area of the circle are equal. the numerical value of the circumference is greater than the numerical value of the area. the numerical value of the circumference is less than the numerical value of the area.

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x