I would love to answer if you tell me what book
Answer:
C
Explanation:
I think it’s C because the two triangles you are comparing are both in the exterior of the lines.
Answer:

Step-by-step explanation:
-Given that 
-We determine the z-value corresponding to the 95% confidence level:

-The margin of error is the degree of error from the real value and is calculated as follows:

Hence, the margin of error is 
7 gallons of pure acid and 14 gallons of 10% acid