Final answer:
The domain of the function h(x) = x - 4 is all real numbers, as subtracting 4 from any real number is valid. Therefore, the correct choice is (A) All real values of x.
Step-by-step explanation:
The domain of a function is the set of all possible input values (typically x values) for which the function is defined. For the function h(x)=x-4, there are no restrictions on the values that x can take, since subtracting 4 from a real number always results in another real number. Therefore, the domain of h is all real numbers.
To express this more formally, we state that the domain of h is x is a real number. In terms of the options provided, answer (A) All real values of x is correct as it does not impose any unnecessary restrictions on the value of x.