https://www.kidsbookseries.com/born-free/
https://www.khanacademy.org/math/algebra2/advanced-functions
https://www.testprepreview.com/modules/algebra2.htm
https://www.urbandictionary.com/define.php?term=Advanced%20Algebra%20and%20Trigonometry
https://www.purplemath.com/modules/index.htm
http://www.mrxmentorofmathematics.com/math_lessons/advanced_algebra
https://www.chilimath.com/lessons/advanced-algebra/
http://analyzemath.com/high_school_math.html
https://ocw.mit.edu/high-school/mathematics/
https://newsela.com/search/#/?needle=A%20LONG%20WALK%20TO%20WATER
https://newsela.com/text-sets/240742