2. The digit sum of a two-digit number is 9 . Let \( x \) be the unit digit of the number. (a) Express the value of the number in terms of \( x \). (b) If the value of the number is twice the value of the product of the two digits, find the value of the number.
Added by Darlene E.
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Step 1: Let the two-digit number be \(10a + x\), where \(a\) is the tens digit and \(x\) is the unit digit. Show more…
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