Answer:

Step-by-step explanation:
The domain of a function is all the set of possible x-values that the function can take. Then, for the given function:

The function is undefined when the denominator is equal to 0, then equalize each factor of the denominator to 0:
Answer:

Step-by-step explanation:
{x -4y = −21
{8y - x = 45
_________

[Plug this back into both equations above to get the x-coordinate of 3]; 
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Answer:
165 jackets or 85%
Step-by-step explanation:
Answer:
756 miles
Step-by-step explanation:
Divide 936 by 13 to get 72, the miles per hour and then multiply by 8
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