(a) What is the angular momentum of a figure skater

(a) What is the angular momentum of a figure skater spinning at 3.5 rev/s with arms in close to her body, assuming her to be a uniform cylinder with a height of 1.5m, a radius of 15cm, and a mass of 55kg?
(b) How much torque is required to slow her to a stop in 5.0 s, assuming she does not move her arms?