Textbook with explanations, perfect for studying Math II. - Title: Focus Gold Math II 5th Edition - Answer Key: Included - ISBN: 978-4-02-224255-3 - Number of Pages: 256 pages - Publisher: Obunsha Thank you for looking. I myself am not good at math, so I received this at school, but I haven't used it much. I only copied the answers for homework... haha. I think Focus Gold's regrets will be relieved if someone can use it in my place... Feel free to offer discounts.