document.write( "Question 647863: Charlie must take four exams in his finite math class. His scores on his first three exams are 91, 77, and 83. What must he score on his fourth exam if he wants his overall mean to be at least 80? \n" ); document.write( "
Algebra.Com's Answer #406437 by stanbon(75887)\"\" \"About 
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His scores on his first three exams are 91, 77, and 83. What must he score on his fourth exam if he wants his overall mean to be at least 80?
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\n" ); document.write( "Solve:
\n" ); document.write( "(91 + 77 + 63 + x)/4 >= 80
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\n" ); document.write( "(231+x) >= 320
\n" ); document.write( "x >= 89
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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