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Answer:
Step-by-step explanation: Hello
-If X represents Roman numerals is 10.
-then 10 decades is 100 years,
-so multiply 3x100 and divide it by 10, that should give you 30.
I hope this is the correct procedure, good luck
Explanation:
Let x = # of decades
If 3 per decade join, then 3x join (3 per {multiply} decade {x})