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Ulleksa [173]
4 years ago
5

Jackie scored 82 and 88 on her first two quizzes. Write and solve a compound inequality to find possible values for a third quiz

score that would give her an average between 80 and 85, inclusive.
a. 80 <= 82 + 88 + n / 3 <= 85; 70 <= n <= 85

b. 70 <= 82 + 88 + n / 3 <= 85; 80 <= n <= 85

c. 80 <= 82 + 88 + n / 3 < 85; 70 < n < 85

d. 82 <= 80 + 85 + n / 3 <= 88; 70 <= n <= 85
Mathematics
2 answers:
aev [14]4 years ago
6 0
The answer is a . first you can understand that b and d can not be the answers because the question says that hey score should be between 80 and 85 so between a and c the answer is a :)))
i hope this is helpful 
Elza [17]4 years ago
5 0

Answer : option A

Jackie scored 82 and 88 on her first two quizzes

Let n be the score of third quiz

Average of 3 quiz = \frac{82+88+n}{3}

average between 80 and 85, inclusive.

so average lies between 80  and 85

Question says 80  and 85 inclusive. so we use <= or >= symbol

So inequality becomes

80

80 ( multiply all sides by 3)

240 (subtract all sides by 170)

70

so option A is correct


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