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To get an A in a course, you must have an average of at least 90% on four tests worth 100 points each. Your scores on the first three tests were 89, 92, and 81. What must you score on the fourth test to get an A in the course?
[tex]4*100=400 -value \ of \ the \ four \ test \\ \\ 90 \% \ of \ 400= \frac{90}{100}*400=90*4=360 \ points \ is \ the \ minimal \\ \\ 89+92+81=262 -\ for \ the \ 3 \ test \\ \\ 360-262=98 \ points \ you \ have \ to \ take \ at \ the \ 4th \ exam[/tex]
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