ONLINE MATHBOOK
http://glencoe.com/sites/common_assets/mathematics/ebook_fl/9780078916472/mhssg_main.html
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https://www.khanacademy.org/math/algebra/rational-and-irrational-numbers/alg-1-irrational-numbers/v/introduction-to-rational-and-irrational-numbers
http://glencoe.com/sites/common_assets/mathematics/ebook_fl/9780078916472/mhssg_main.html
NEED HELP!
www.khanacademy.com
or
Google it by concept
ACCESS TO GRADES
www.focus.com
https://www.khanacademy.org/math/algebra/rational-and-irrational-numbers/alg-1-irrational-numbers/v/introduction-to-rational-and-irrational-numbers