of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah a B for the semester (an average between 80 and 89, inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation.
of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah a B for the semester (an average between 80 and 89, inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation.
College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter2: Functions And Graphs
Section2.3: Linear Functions And Slope
Problem 106E
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In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Sarah has scored 89, 91, and 83 on the first three. What range of scores on the fourth test will give Sarah a B for the semester (an average between 80 and 89, inclusive)? Assume that all test scores have a non-negative value.
Express your answer in interval notation.
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