document.write( "Question 1193156: In trapezoid ABCD (not shown),
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Algebra.Com's Answer #825155 by Edwin McCravy(20056)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "∠B and ∠C are supplementary because they are interior angles on \r\n" );
document.write( "the same side of transversal BC which cuts parallel lines \r\n" );
document.write( "AB and CD.  Therefore: \r\n" );
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document.write( "m∠B + m∠C = 180o\r\n" );
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document.write( "\"%28x%2F3%2B50%5Eo%29%2B%28x%2F5%2B50%5Eo%29=180%5Eo\"\r\n" );
document.write( "\"x%2F3%2B50%5Eo%2Bx%2F5%2B50%5Eo=180%5Eo\"\r\n" );
document.write( "\"x%2F3%2Bx%2F5%2B100%5Eo=180%5Eo\"\r\n" );
document.write( "\"x%2F3%2Bx%2F5=80%5Eo\"\r\n" );
document.write( "Multiply through by 15\r\n" );
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document.write( "Solve for x. \r\n" );
document.write( "That's a linear equation, so there will be only one value.\r\n" );
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document.write( "Edwin
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