Answer: 
Step-by-step explanation:

None, you wrote a different function than the one in the picture.
The answer to the picture is the last graph
A. Is 6x+9x and 15x
B. Is 4 times 1 plus 4 times 9y and 4+36y
The two numbers are -18+ 2√(11) and -18 -2√(11).
-18+ 2√(11)+ [-18 -2√(11)]= -36
[-18+ 2√(11)]* [-18 -2√(11)]= 280.
Hope this helps~
It depends. For example the GCF of 4 &2 is 4, so in a sense yes. With other numbers (such as odds) that is not always the case :D