Answer:
the set of all real numbers
Step-by-step explanation:
f(x) = 3X + 9 is a polynomial, and so both the domain and the range are "the set of all real numbers."  
None of your answer choices match this.  Check with your teacher if you can.
 
        
             
        
        
        
9514 1404 393
Answer:
   the listed sequences have no common difference(s)
Step-by-step explanation:
The differences in the first sequence are ...
   8, 10, -1, 19
These values are not equal, so there is no common difference.
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The differences in the second sequence are ...
   -3, 3, -3, 3
These values are not equal, so there is no common difference.
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The difference is the difference between a term value and the one before.
   1 -(-7) = 8
   3 -6 = -3
 
        
             
        
        
        
Y=x. I hope that this helped! Good luck! :)
        
                    
             
        
        
        
$45+$18+$26-$21-$93
45+18=63
63+18=81
81+26=107
107-21=86
86-93=-7