Question: In a class in which the final course grade depends entirely on the average of four equally weighted loo-point tests, Erica has scored 86, 79,

In a class in which the final course grade depends entirely on the average of four equally weighted loo-point tests, Erica has scored 86, 79, and 85 on the first three. What range of scores on the fourth test will give Erica a C for the semester (an average between 70 and 79, inclusive)? Assume that all test scores have a nonnegative value. Express your answer in interval notation

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