document.write( "Question 930132: Roberto's grades on four test were 90, 65, 82, and 73. What must be his lowest grade on the next test in order to have an average greater than 80? \n" ); document.write( "

Algebra.Com's Answer #564707 by TimothyLamb(4379) $\"\"$ $\"About$

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(90 + 65 + 82 + 73 + x)/5 = 80
\n" ); document.write( "(90 + 65 + 82 + 73) + x = 80*5
\n" ); document.write( "x = 80*5 - (90 + 65 + 82 + 73)
\n" ); document.write( "x = 90
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "he must score better than 90 on the 5th test to get a five-test average score over 80
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