Posted by **reena** on Saturday, February 11, 2012 at 10:04pm.

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.0

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