Fiona can assemble a bookcase in 0.8 hour. She works for
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We need to know the definition of the "combined function" h(x). I'm going to guess--by looking at answers--that the function is 
making it
This function is undefined wherever the denominator is equal to 0 (division by zero is undefined). Factor the denominator.
The two values of x that make the denominator 0 are 3 and -3, otherwise written
.
This function is undefined wherever the denominator is equal to 0 (division by zero is undefined). Factor the denominator.
The two values of x that make the denominator 0 are 3 and -3, otherwise written