1. 25 is a terminating number and would be a rational decimal.
2. -0.07 is a terminating number and would be a rational decimal.
3. 49 is a terminating number and would be a rational decimal.
4. 99√ is an irrational number and would be a non-terminating/non-repeating decimal.
5. -0.03521... is a non-terminating/non-repeating number and would be an irrational decimal.
6. 121√ is an irrational number and would be a non-terminating/non-repeating decimal.