Well, darling, "Ixx" is just a placeholder used in engineering to represent a moment of inertia about the x-axis. It's basically a fancy way of saying how resistant an object is to changes in rotation around that particular axis. So, next time you hear "Ixx," just remember it's all about that rotational resistance, honey.
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In Roman numerals, IXX means 910. X is 10, IX is 9. In Roman times, they used a few letters to make their number system.
This math riddle relates to Roman Numerals where 19 is IXX, 1 is I, and 20 is XX. By removing I from IXX, you are left with XX.
19
........___ VI/X/IXX XC I That line over IXX is crucial. remove/ignore the dots...
IXX
Due to rules made during the Middle Ages, today we write out 19 in Roman numerals as XIX. But the Romans themselves would have probably wrote out 19 as XVIIII and then simplified it to IXX. In fact the Latin word for 19 is "undeviginti" which literally means one from twenty. Hence: IXX*IXX = -I*IXX + XX*IXX = +I-XX-XX+CCCC = CCCLXI (361) In Hindu-Arabic numerals: -1(-1+20) + 20(-1+20) = +1-20-20+400 = 361