using reynolds number vs C

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    when calculating head loss  there is a pipe that connects points A and B. it gives pipe length, diameter, pipe material, temperature of water and the flow  Q. B is 60 feet above Point A. it asks the pressure at point A if the pressure B is 50..

    when i did this, i used C from the tables, coefficient of friction for the steel pipe in order to calculate the head loss. i didnt use the temperature at all. but they used the temperature information and did it by calculating reynolds number. how do we know when we use C or reynolds number when calculating the head loss hf? why didnt they use the formula with the L, C, V, D to calculate the head loss? I used that one and still was able to calculate something. although it was wrong. they used the Reynolds number. I didnt understand why

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