What is the average number of books read by a group of 20 students, given that each student read 5, 8, 6, 10, 7, 9, 5, 4, 8, 7, 6, 9, 7, 6, 5, 7, 6, 8, 9, and 4 books, respectively?
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Math question: "Factorize the expression 4x² + 8xy - 12x - 24y using the distributive property."
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What is the derivative of f(g(h(x))) with respect to x, where f, g, and h are functions?