theorem
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the moment of inertia of a body about a given axis is equal to the sum of its moment of inertia about a parallel axis passing through its centre of mass and the product of its mass and square of perpendicular distance between two axis Iz=Ix+Iy
It is: 9 because IX means 10-1 = 9
IX (9) + XV (15) + XX (20) = XLIV (44)
36
They are the Roman numerals for 9, 10, 16 and 17.