What is the domain of the function y is equal to 2 square root of x minus 5 end root ?

For a square root to produce a real number, the expression inside the radical must be at least 0. Here the radicand is x − 5, so x − 5 ≥ 0, which gives x ≥ 5. The domain is therefore all real numbers greater than or equal to 5, choice C.

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