document.write( "Question 1171981: A student received scores of 86, 76, and 90 on three quizzes, what is the lowest score the student can get on the next test to achieve an average score of at least 70? \n" ); document.write( "

Algebra.Com's Answer #796883 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "Let x be the unknown value under the problem's question.\r\n" );
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document.write( "Then the average score is  .\r\n" );
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document.write( "So, you have this inequality\r\n" );
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document.write( "     >= 70\r\n" );
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document.write( "to find x.\r\n" );
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document.write( "Multiply both sides by 4 and then simplify\r\n" );
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document.write( "    86 + 76 + 90 + x >= 280\r\n" );
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document.write( "    252 + x          >= 280\r\n" );
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document.write( "          x          >= 280 - 252 \r\n" );
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document.write( "          x          >=  28..\r\n" );
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document.write( "ANSWER.  The fourth score must be at least 28.\r\n" );
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\n" ); document.write( "\n" ); document.write( "To see many other similar solved problems, look into the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Solved problems on average scores, weight, height and temperature\r
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\n" ); document.write( "\n" ); document.write( "Consider these lessons as your textbook, handbook, tutorials and (free of charge) home teacher.\r
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