document.write( "Question 285581: a student scored 71,83, & 96 on three algebra tests. What must he score on the 4th test in order to have an average grade of at least 85? \n" ); document.write( "

Algebra.Com's Answer #206986 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"x\"$ = grade on 4th test
\n" ); document.write( " $\"%2871+%2B+83+%2B+96+%2B+x%29%2F4+=+85\"$
\n" ); document.write( " $\"%28250+%2B+x%29%2F4+=+85\"$
\n" ); document.write( " $\"250+%2B+x+=+4%2A85\"$
\n" ); document.write( " $\"250+%2B+x+=+340\"$
\n" ); document.write( " $\"x+=+90\"$
\n" ); document.write( "He must score 90
\n" ); document.write( " \n" ); document.write( "

\n" );