Thank you for viewing. This is a set of three Focus Gold textbooks covering the basics to advanced topics in mathematics: I + A, II, and B + C. They are new and unused, with the answer keys included. All three books have only been opened a few times, so they are in good condition. There are small circles and crosses written in pencil on some problems in IA, but they can be erased. - Series Name: Focus Gold 5th Edition - Subject: Mathematics I + A - Subject: Mathematics II - Subject: Mathematics B + C - Answer Key: Complete answers for all topics included