If b, c, x, and y are positive and , which of the following must be true?

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If <em>b</em>, <em>c</em>, <em>x</em>, and <em>y</em> are positive and <img alt='Image' src='https://www.fatskills.com/images3/gre/inequ11_131.jpg'/><br>, which of the following must be true?