Inequalities

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Shelby's test scores are 99, 91, and 85. If she must average at least 90 points to get an A in the class, what must she earn on the next test?

Okay so this was my equation but it came out completely wrong.

99+91+85+x greater than or equal to 90

So what should the equation be?

  • Inequalities -

    You're very close but you left out one thing. You have to divide to find averages, so:
    (99+91+85+x)/4>=90
    99+91+85+x=360
    Take it from here.

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