Algebra

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A student scored 81 and 95 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.

  • Algebra -

    85<((81+95+x)/3)<90.
    85<((176+x)/3)<90
    Multiply by 3:
    255<(176+x)<270
    Subtract 176:
    79<X<94.

    Third quiz between 79 and 94.

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