A possible practical domain for the function is T > 12500
The domain are the input values for which a function exist.
Given the function relating the metal bar is L cm long when its temperature is Tâ—¦C as:
L(T) = 0.002T + 25
The domain of the expression is the point where 0.002T + 25 is greater than zero.
0.002T + 25 > 0
0.002T > -25
T > 12,500
Hence  a possible practical domain for the function is T > 12500
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