The domain of $$ f(x)=4 e^{-x} $$ is $$ \square $$ (Type your answer in interval notation.)

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1. The function is given by $$ f(x) = 4e^{-x} $$.
2. The exponential function $$ e^{-x} $$ is defined for all real numbers.
3. Multiplying by 4 does not restrict the domain.
4. Therefore, the domain of $$ f(x) $$ is all real numbers.

The answer in interval notation is: $$ (-\infty, \infty) $$.
The domain of $$ f(x) = 4e^{-x} $$ is all real numbers, which in interval notation is $$ (-\infty, \infty) $$.

The domain of is
(Type your answer in interval notation.)

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The domain of is (Type your answer in interval notation.)