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1. 25 is a whole number and would be a whole number.
2. −0.07 is a decimal number and would be a decimal number.
3. 49 is a whole number and would be a whole number.
4. 99−−√ is a square root and would be a square root.
5. −0.03521... is a decimal number and would be a decimal number.
6. 121−−−√ is a square root and would be a square root.