Answer:
x=10 and scale factor is 15/9 or 1 2/3
Step-by-step explanation:
FIrst, find scale factor. 9 to 15. Times by 15/9 or 1 2/3.
Find x. 6*1 2/3 = 10
Answer:
B
Step-by-step explanation:
Recall that 
So now

4ab + 7ax + 8b - 14x
a(4b - 7x) + 2(4b - 7x)
(4b - 7x)(a + 2)
The answer is: (4b - 7x)(a + 2).
Answer:
Vertical
Step-by-step explanation:
Intersecting lines form Vertical angles.