Mathematics, 19.09.2021 14:10 zivicion

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Sarah has scored 86, 85, and 84 on the first three. What range of scores on the fourth test will give Sarah a C for the semester (an average between 70 and 79, inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation.

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