Answer:
Step-by-step explanation:

Answer:
A) the unknown is 5
B) the unknown is also 5
C) unknown is 23
D) unknown is 19
Step-by-step explanation:
Hope this is right and helps!
Answer:
B,C, and E
Step-by-step explanation:
just do the math...
Answer:
3x^2+12x+12
Step-by-step explanation:
i think you just sub in x+2 into 3x^2