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math question?

in your class, you have scores of 66, 83, 79, and 86 on the first four of five test. to get a grade of C, The average of the first five test scores must be greater than or equal to 70 and less than 80. 

a) solve an inequality to find the least score you can get on the last test and still earn a C? 

b) what score do you need if the fifth test counts as to test? 

1 Answer

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  • fcas80
    Lv 7
    1 month ago

    70 <= (66 + 83 + 79 + 80 + x) / 5 < 80

    350 <= 308 + x < 400

    42 <= x < 92

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