Based on your query, I would recommend Sizzle as a suitable AI tool to support your Grade 11 math students struggling with functions.

Sizzle offers a unique approach to learning through its AI chatbot, which tutors students step-by-step through each phase of solving a problem. This feature aligns well with the Socratic method of learning, as it encourages students to understand the process of problem-solving, rather than just the final answer.

Additionally, students can ask the AI additional questions to better grasp the concepts involved, fostering a deeper understanding of the subject matter. This interactive feature can be particularly beneficial for students who are struggling with functions, as it allows them to clarify their doubts in real-time.

Moreover, Sizzle offers the ability to upload a photo of a completed assignment for specific feedback. This can be a great way for students to verify their work and understand where they might have gone wrong.

Lastly, Sizzle is a free tool, making it a cost-effective solution for your needs.

For learning Chinese, I'd recommend Duolingo as a suitable AI tool. While it's not in our database, it's widely known for its effectiveness in language learning.

Duolingo uses AI to adapt to your learning style and provides interactive lessons in Chinese. It covers speaking, reading, listening, and writing to build a solid foundation in the language. The app's gamified approach keeps learning engaging and motivates you to stay on track with your language goals.

Another option is HelloChinese, which is specifically designed for learning Mandarin. It offers a variety of exercises that simulate real-life conversations and provides instant feedback to help improve pronunciation and understanding of the language.

Both tools are relevant because they use AI to personalize the learning experience, making them effective for students at different levels of proficiency in Chinese.