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Use graphing technology to find the domain of the function $f(x)=-|x-4|$.
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$\phi \quad$ or
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$\infty$
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All Real Numbers

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$\boxed{\text{All Real Numbers}}$

Steps

Step 1 ：The function is f(x)=-|x-4|

Step 2 ：The absolute value of a number is always non-negative, so |x-4| is always greater than or equal to zero

Step 3 ：Therefore, -|x-4| is always less than or equal to zero

Step 4 ：The range of f(x) is the set of all non-positive real numbers

Step 5 ：The domain of a function is the set of all possible input values

Step 6 ：Therefore, the domain of f(x) is all real numbers

Step 7 ：$\boxed{\text{All Real Numbers}}$