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29 January, 10:29

A student scored 84 and 87 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.

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  1. 29 January, 10:46
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    Let the third score be x, then

    85 ≤ (84 + 87 + x) / 3 ≤ 90

    255 ≤ 171 + x ≤ 270

    84 ≤ x ≤ 99
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