The graph of which function is decreasing over the interval
)

Step-by-step explanation:

1- It's known that shifting(called translation), reflection and rotation operations on th function would let us manipulate it as we like, and taking the square root function

would let us to start graphing from the desired point in the xy-plane by using shifting operations on it.

2- Taking the minus of the square root function

would reflect the function over x-axis so the function would be decreasing from 0 to infinity.

3- Then, adding 4 to x in the square root

would make the domain of the function to start from or (by adding 4 to both sides).

4- Finally, the function of the domain (-4, ) is

.

I hope that I helped, and i'm sorry for any English mistakes(I'm not English speaker) .