final awnser given as a numerical value

A 8.71kg particle with velocity v=(3.72m/s)i^(1.98m/s)j^ is at x=6.29m,y=7.81m. It is pulled by a 4.92 Norce in the negative direction. About the origin, what are (a) the particle's angular momentum, (b) the torque acting on the particle, and (c) the rate at which the angular momentum is changing? (a) Number k^ Units (b) Number k^ Units (c) Number k^ Units