This is a school-purchased textbook, so the answer key is completely separate from the main text. There may be some markings, such as circles, etc. Also, the back of the answer key has water damage. It will be packaged to prevent water damage and shipped via Yu-Packet Post. A reference book containing solutions and exercises for Mathematics I + A. - Title: Mathematics I + A - Format: Solutions and Exercises - Publisher: Kenkyusha Publishing - Title: Mathematics I + A Answer Key - Format: Solutions and Exercises Thank you for viewing.