I believe it's A. Hope it helps :)
A) 1/2*12 = 6 ft above sea level
B) Because City D is 1/2 of 6, it cannot be negative because we are not multiplying anything by a negative number.
Answer:

Step-by-step explanation:
The given parabola has equation

We rewrite in standard form to obtain:


Split the middle terms to get:

Factor by grouping:



The answer is no question for you lol