This is a textbook for learning the basics of mathematics, specifically "Mathematics I+A from Basics" with an answer key. It's a great book for solidifying your foundation in math. - Title: Mathematics I+A from Basics - Author: Chart Research Institute, Edited by - ISBN: 978-4-10-10378-0 - Publisher: Suken Shuppan - Format: Chart-style - Answer Key: Included - Price: 1950 yen (excluding tax) Thank you for looking.