Solve the problem.The grading scale for a C in Amy's biology class is an average on tests between 70% and 80%, inclusive. Amy has 66%, 85%, and 76% on the first three tests this semester. What range of scores on the fourth test would give her a C?
A. Between 53% and 93%, inclusive
B. 88% or better
C. Between 70% and 80%, inclusive
D. Between 58% and 88%, inclusive
Answer: A
Mathematics
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, for x = 81 and y = 27
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A. 
B. 
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D. 
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