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Mathematics 16 Online
OpenStudy (anonymous):

For every positive 2-digit number x with tens digit t and units digit u, let y be the 2-digit number formed by reversing the digits of x. Which of the following expressions is equivalent to x - y? A. 9(t - u) B. 9(u - t) C.9t - u D. 9u - t E. 0

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