SOLUTION: Cindy has scores of 73,83,85,90 on her biology tests. Use a compound inequality to find the range of scores she can make on her final exam to receive a C in the course. The final e

Algebra ->  Algebra  -> Inequalities -> SOLUTION: Cindy has scores of 73,83,85,90 on her biology tests. Use a compound inequality to find the range of scores she can make on her final exam to receive a C in the course. The final e      Log On

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Question 214099: Cindy has scores of 73,83,85,90 on her biology tests. Use a compound inequality to find the range of scores she can make on her final exam to receive a C in the course. The final exam counts as two tests, and a C is received if the final course average is from 70 to 79
Answer by scott8148(5885) About Me  (Show Source):
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70 ≥ (73 + 83 + 85 + 90 + 2x) / 6 ≥ 79

70 ≥ (331 + 2x) / 6 ≥ 79

420 ≥ 331 + 2x ≥ 474

89 ≥ 2x ≥ 143

44.5 ≥ x ≥ 71.5