document.write( "Question 1142779: If Katie scores an 80,83 and an 88 on her first 3 tests, what must she score in her fourth test if she wants an average of 85? \n" ); document.write( "

Algebra.Com's Answer #763513 by ikleyn(52786) $\"\"$ $\"About$

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document.write( " = 85\r\n" );
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document.write( "80 + 83 + 88 + x = 4*85\r\n" );
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document.write( "x = 4*85 - 80 - 83 - 88 = 89.      ANSWER\r\n" );
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