Final answer:
Educational Decrees implemented by Dolores Umbridge at Hogwarts included: Educational Decree No. 22, Educational Decree No. 25, and Educational Decree No. 27.
Step-by-step explanation:
During Dolores Umbridge's tenure as the Defense Against the Dark Arts teacher and later as the Hogwarts High Inquisitor, she implemented several Educational Decrees at Hogwarts. These included:
- Educational Decree No. 22 - Allowed Dolores Umbridge to review and change the curriculum at Hogwarts.
- Educational Decree No. 25 - Gave Dolores Umbridge the authority to inspect and dismiss teachers at her discretion.
- Educational Decree No. 27 - Gave Dolores Umbridge the power to appoint replacement teachers if necessary.
These decrees aimed to increase Umbridge's control over the school and limit the influence, resulting in a turbulent and oppressive atmosphere at Hogwarts.