Posted by **Kendra** on Thursday, September 9, 2010 at 10:36pm.

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?

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