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TestTakingLifesaver Group Title

A student scored 83 and 91 on her first two quizzes. Write and solve a compound inequality to find the possible values for a third quiz score that would give her an average between 85 and 90, inclusive

  • one year ago
  • one year ago

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  1. Australopithecus Group Title
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    83 and 91 are the limits inclusively We can just take the average of the 3 tests, since we dont know the value of the third test it is our x value, then just place that between the limits and solve for x 85 <= (x + 83 + 91)/3 <=90 So first solve this, (x + 83 + 91)/3 <=90 then solve this, 85 <= (x + 83 + 91)/3 Then simply place the values you get into square brackets

    • one year ago
  2. TestTakingLifesaver Group Title
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    @Australopithecus Best Responce, thanks

    • one year ago
  3. TestTakingLifesaver Group Title
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    Could you simplify please?

    • one year ago
  4. Australopithecus Group Title
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    treat it like an equality and solve for x, just remember if you multiply or divide by a negative you have to flip the inequality sign

    • one year ago
  5. Australopithecus Group Title
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    other than that it is just simple algebra, make an attempt at it if you get stuck I will help you

    • one year ago
  6. Australopithecus Group Title
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    You can use wolframalpha to check your solution as well

    • one year ago
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