PLEASE HELP!! what is the domain of the function below???

f(x) = 57 (19)^(x-4)
The domain is the input or x values
what are the allowed x values
we can put in any values of x we want and the function still works
Domain: all real values
The range is the output or the y values
It will always be greater than 0
Range: y> 0 or all positive real numbers