In a circle, an angle measuring 8.2 radians intercepts an arc of length 30. Find the radius of the circle to the nearest ioth.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?