In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Mark has scored 9090, 8686, and 8585 on the first three. What range of scores on the fourth test will give Mark a C for the semester (an average between 7070 and 7979, inclusive)? Assume that all test scores have a non-negative value. Express your answer in interval notation.

In a class in which the final course grade depends entirely on the average of four equally weighted 100-point tests, Mark has scored 9090, 8686, and 8585 on the first three. What range of scores on the fourth test will give Mark a C for the semester (an average between 7070 and 7979, 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 105E

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