Answer and Step-by-step explanation:

The domain is all real numbers <u>except</u> 9 (positive)
This is because we can't have 0 in the denominator, and when x equals 9, then the denominator is 0. Anything divided by 0 is undefined, which is why 9 (in this equation) is <u>not</u> included.
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Answer:
2.4 hours
Step-by-step explanation:

2.4 hours
Answer:
blank A is 9. Blank B is 41. Blank C is 18. Blank D is 24
Answer:m =-1
Step-by-step explanation:
To solve m=-(4+m)+2
Open the brackets
m=-4-m+2
Collect like terms
m+m=-4+2
2m=-2
Divide through by -2
m=-1