100 4x + 6 (4) (6 points) Determine whether the improper integral dax converges or di- o x2 + 3r + 1 verges. Evaluate the integral if it converges.{1) {'5 points} Find the mass of a at circular washer with inner radius :1 and outer radius 2.5.: if its mass density lie-(33.. y) is inversl},r proportional to the square of distance from the center. {2) {6 points) Suppose that washer from the previous problem is out along .raxis in two equal parts. Find the center of mass of the top part. (1; :=- (l)