1. 2/5 is a rational number and would be a nonterminating/nonrepeating decimal.
2. −0.07 is a rational number and would be a terminating decimal.
3. 4/9 is a rational number and would be a nonterminating/nonrepeating decimal.
4. √99 is an irrational number and would be a nonterminating/nonrepeating decimal.
5. −0.03521... is a rational number and would be a repeating decimal.
6. √121 is a rational number and would be a terminating decimal.