SOLUTION: 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

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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
Answer by Edwin McCravy(20054) About Me  (Show Source):
You can put this solution on YOUR website!
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
20% of X + 80% of 93 >= 90

    .2X + .8(93) >= 90
      .2X + 74.4 >= 90
             .2X >= 15.6
               X >= 15.6%2F.2
               X >= 78

She needs to make at least 78.

Edwin