Final answer:
The value of h(4.9) is 12.3 since h(x) is defined as a constant function where the output does not depend on the input value 'x'.
Step-by-step explanation:
The value of h(4.9) when given that h(x) = 12.3 is simply the constant value 12.3. The function h(x) is defined as a constant function, meaning that for any input 'x', the output will always be the same constant value, in this case, 12.3. Therefore, the answer is option 1) 12.3. It doesn't matter what the value of 'x' is; similarly, the value for h(4.9), h(2), or h(100) would still be 12.3.