Asked by green bottle fly

On the past two quizzes, a student scored a 75 and 83. Write and solve a compound inequality to find the possible values for the 3rd quiz score that would give her an average between 85 and 90, inclusive.
average = sum of all values/number of values
i have no clue how to do this im screaminh pleas teach me
Answered by CodyJinks
85<= 75+83+x <= 90
Answered by oobleck
Not quite.

85*3 <= 75+83+x <= 90*3
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