It depends on what the question is and what level of mathematics you have mastered.
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It is not possible to answer the question since no equation is given in the question: only an expression.
Unfortunately, limitations of the browser used by Answers.com means that we cannot see most symbols. It is therefore impossible to give a proper answer to your question. Please resubmit your question spelling out the symbols as "plus", "minus", "times", "equals". There is no equation in the question.
To turn the fraction into a decimal, simply solve the equation. 52/8 means 52 divided by 8. The answer is 6.5.
It might have been possible to answer the question if you had bothered to include any equations below. But since you haven't there can be no answer.
If the question is, how many cubic feet are in a cubic yard, then you would get that result, 3'x3'x3' = 27 cubic feet.