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algebra 1 help please

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4) a student score is 83 and 91 on her first two quizzes. write and solve a compound inequality to find possible values for a thord quiz score that would give anverage between 85 and 90.

a. 85≤83+91+n/3 ≤90; 81≤n≤96
b. 85≤83+91/2+n≤90; -2≤n≤3
c. 90≤83+91+n/3 ≤85; 96≤n≤81
d. 83≤85+91+n/3 ≤90; 73≤n≤94

i don't understand this question

  • algebra 1 help please - ,

    Average of three quizzes :

    Av = ( 83 + 91 + n ) / 3

    must be equal or greater of 85 and equal or less of 90

    85 <= ( 83 + 91 + n ) / 3 <= 90

  • algebra 1 help please - ,

    Ggvgh f

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