how does 285/9 - 5 square = 20/3

trying to have the covariance.  285 over 9 - 5 squared = 20/3 but not sure how the teacher got 20/3.  I get 6.66666667
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1 Answer

285/9-25=(285-225)/9=60/9=20/3. This is the same as 6.666... so you are both right.
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