The answer is the first one 6/7ab
Answer:
5 should be subtracted from each term
Step-by-step explanation:

Cross multiply,
1 * (11 - x) = 2*(8-x)
11 -x = 2*8 - 2*x
11 - x = 16 - 2x
Subtract 11 from both sides,
-x = 16 - 2x - 11
-x = 5 - 2x
Add 2x to both sides
-x +2x = 5 - 2 + 2x
x = 5
Answer: 600 ft.
Step-by-step explanation:
The height is 12, and the base is 50. So V=ABh=50·12=600ft³, just plug in the numbers.