Can you help me with this Real Analysis problem, please? (Just #3 which is listed here) (Can you have the answer written on paper too, please? I feel like I can read it easier that way. Thank you very much!)

Exercise 4.6.1. [Used in Lemma 4.6.2.] Prove Lemma 4.6.2 (1) (3).Lemma 4.6.2. Let I C |' be a non-depenerate open interval, and let f: | R be a function. Suppose that f is strictly monotone. 3. If f is continuous and strictly increasing ( or strictly decreasing), then the func- tion f-: f(1) - I is continuous and strictly increasing ( or strictly decreasing, respectively)