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Mathematics
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OpenStudy (halloweeninheaven):
Juan has 20 books to sell. He sells the books for $15 each. The amount of money Juan makes from selling x books is represented by a function. f(x)=15x What is the practical range of the function? All multiples of 20 between 0 and 300, inclusive. All integers from 0 to 20, inclusive. All multiples of 15 between 0 and 300, inclusive. All real numbers.
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