Which expression represents the distance between the points open paren A comma 0 close paren and open paren 0 comma 5 close paren on a coordinate grid?

Use the distance formula: the horizontal difference between (A, 0) and (0, 5) is A, and the vertical difference is 5. The distance is therefore √(A² + 5²) = √(A² + 25), which is choice C.

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