Answer: D, All of the above
Step-by-step explanation:
Answer:
x = 3
Step-by-step explanation:
We can solve this by using ratios of similar triangles
3 x
------ = ------------
3+9 12
3 x
------ = ------------
12 12
x must equal 3 to keep the ratios the same
I believe it is 10 and however many zeros there are and there's 6 so if I'm not mistaken the answer is

.
Answer:
the answer is attached to the picture
BD = AC/2
4x+2 = (5x+13)/2
2(4x+2) = 5x+13
8x + 4 = 5x+13
8x - 5x = 13 -4
3x = 9
x = 3