Let's categorize each number into the most specific set:
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√47: This number is an irrational number (it cannot be expressed as a fraction and is not a perfect square).
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√144: This is equal to 12, which is a whole number (and also a natural number since it is positive).
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0: This number fits in the set of integers (and it is also a whole number, but "integers" is a more specific category).
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0.121212...: This is a rational number (it can be expressed as a fraction, specifically 12/99 or 4/33).
-
-9: This number is an integer (and also a whole number if considering non-negative integers, but it's most specifically categorized as an integer).
So, the complete categorization would be:
- √47: Irrational
- √144: Whole
- 0: Integer
- 0.121212...: Rational
- -9: Integer
Let me know if you need further assistance!