How do u find the domain to the first one

The domain is (-infinity, -3) ∪ (-3, 3) ∪ (3, infinity)

Step-by-step explanation:

This function is defined for all t such that the denominatory t^2 - 9 is not zero (0).  Purposely setting t^2 - 9 = 0, we find that t = 3 or t = -3.

This function defined everywhere except at {-3, 3}.

The domain is (-infinity, -3) ∪ (-3, 3) ∪ (3, infinity)

answer: 88

step-by-step explanation: