Question 834284
Let A through H be the grades on her first 8 tests,
{{{(A+B+C+D+E+F+G+H)/8=88}}}
{{{A+B+C+D+E+F+G+H=704}}}
Now adding the next test, S,
{{{(A+B+C+D+E+F+G+H+S)/9=90}}}
{{{(704+S)/9=90}}}
{{{704+S=810}}}
{{{highlight(S=106)}}}
I hope they give 6 extra credit points.