document.write( "Question 83277: after taking 3 math quizzes elisa has an average of 89. what must she score on the fourth quiz t raise her average to 91. \n" ); document.write( "
Algebra.Com's Answer #59795 by stanbon(75887)\"\" \"About 
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after taking 3 math quizzes elisa has an average of 89. what must she score on the fourth quiz t raise her average to 91.
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\n" ); document.write( "If she averaged 89 on 3 quizzes she has 3*89 = 267 points.
\n" ); document.write( "Let x be the score she needs to average 91:
\n" ); document.write( "(267+x)/4 = 91
\n" ); document.write( "267+x = 364
\n" ); document.write( "x = 97 (score she needs on the 4th quize)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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