Find the Domain of Each Function Using Interval Notation: f(x) = x/x PLUS 2 MORE EXAMPLES!

For the following exercises, find the domain of each function using interval notation.
f(x) = sqrt(x - 6)/sqrt(x - 4)
f(x) = x/x
f(x) = (x2 - 9x)/(x2 - 81)

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[webfiction]

This helped me out so much, thanks a lot!

[rayanazad]

How to find range of this function example one please ?!