RS, refers to Recommender Systems, please answer this question accurately.

1. calculate the rating of Alice on movie 5: 1) using user-based CF and Pearson correlation similarity measure 2) using item-based CF and cosine similarity measure Moviel Movie2 Movie3 Movie4 Movie) Alice 5 3 4 ? 4 3 User1 3 2 3 3 3 5 User2 User3 User4 3 3 1 4 5 5 2 1 2. How to evaluate a RS? 3. Explain the basic idea of TF-IDF. What kind of RS use this metric