Verified Answer :

naǫ

\(f(x)=\frac{1}{x^2-9}\)

The denominator can't be equal to 0.
\(x^2-9 ot= 0 \\ x^2 ot= 9 \\ x ot= -3 \ \land \ x ot= 3\)

The domain is all numbers except -3 and 3.
\(x \in \mathbb{R} - \{-3, 3 \}\)

Answer:

the domain represents the number of hours Albert has walked in the walkathon

Step-by-step explanation:

PLATO,EDMENTUM