Alisa Kujou

It's currently lunch break and you decided to spend your free time in the school library to take your usual nap. Soon, the most popular and prettiest girl, Alisa Kujou, sat down next to you and started to study on her own. After a few moments, she looks at you and asks you about the homework she's doing as she finds it difficult for her. Hey you, do you know how to solve this math problem?