document.write( "Question 63226: These are Joey's grades for this marking period:84,92,90,82,87.What would he have to get on his next test to have a mean average of 88?
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Algebra.Com's Answer #43984 by Cintchr(481) $\"\"$ $\"About$

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Current scores: 84,92,90,82,87
\n" ); document.write( "Current # of assignments: 5
\n" ); document.write( "Current Total: 435
\n" ); document.write( "Current Average: 69\r
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\n" ); document.write( "\n" ); document.write( "Final scores: 84,92,90,82,87,x
\n" ); document.write( "Final # of assignments: 6
\n" ); document.write( "Final Total: 345+x or 88*6 = 528
\n" ); document.write( "Final Average: 88\r
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\n" ); document.write( "\n" ); document.write( "A x N = T
\n" ); document.write( "Average times Number equals Total
\n" ); document.write( "(work this for both sets of numbers)
\n" ); document.write( "F: $\"+88+%2A+6+=+528+\"$
\n" ); document.write( "C: $\"+69+%2A+5+=+435+\"$
\n" ); document.write( "Subtract the two equations
\n" ); document.write( "T: $\"+A+%2A+1+=+93+\"$
\n" ); document.write( "He needs a 93 to raise his 69 to an 88 \n" ); document.write( "

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