Your test scores in one class are 81 and 89. What possible scores can you earn on your next test to have a test average between 85 and ,90 inclusive?

1 answer

85 <= (81+89+x)/3 <= 90

255 <= x+170 <= 270
85 <= x <= 100

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Your test scores in one class are 81 and 89. What possible scores can you earn on your next test to have a test average between 85 and ​,90 ​inclusive?

85 <= (81+89+x)/3 <= 90

Your test scores in one class are 81 and 89. What possible scores can you earn on your next test to have a test average between 85 and ,90 inclusive?