Two particles of mass m₁ = 15 kg and m₂ = 25 kg are connected by a massless rod of length 1.2 m. Find the moment of inertia of this system for rotations about the following pivot points: (a) the center of the rod, (b) the end at m₁, (c) the end at m₂, and (d) the center of mass. Assume the rotation axis is perpendicular to the rod.