Question 750892
What does Emma need to make on her final exam (20%) of her grade to keep her current average (93) to at least a 90 (a-) average
<pre>
20% of X + 80% of 93 >= 90

    .2X + .8(93) >= 90
      .2X + 74.4 >= 90
             .2X >= 15.6
               X >= {{{15.6/.2}}}
               X >= 78

She needs to make at least 78.

Edwin</pre>