Given the expression: 5x^10 − 80x^2

part a: rewrite the expression by factoring out the greatest common factor. (4 points)

part b: factor the entire expression completely. show the steps of your work. (6 points)

Suppose that circtes a and b have a central angle measuring 100. additionally, the measure of the sector for circle a is 10 m2 and for circle b is 40 m2 if the radius of circle a is 6 m, what is the radius of circle b?