A 4.0-kg mass is placed at (3.0, 4.0) m, and a 6.0-kg mass is placed at (3.0, -4.0) m. What is the moment of inertia of this system of masses about the x-axis?
a. 160 kg•m2
b. 90 kg•m2
c. 250 kg•m2
d. 32 kg•m2
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