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OpenStudy (anonymous):
Simplify by rationalizing the denominator: 7 over square root of 21 A. B. C. D.
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jimthompson5910 (jim_thompson5910):
|dw:1366856339688:dw|
jimthompson5910 (jim_thompson5910):
Multiply top and bottom by the denominator sqrt(21) to get |dw:1366856367268:dw|
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