Answer:
Step-by-step explanation:
The base function is given as
This graph opens up and has its vertex at the origin.
When we shift the graph of this function down by 9 units, its vertex is now at (0,-9)
The equation of this new graph is
y=∣x∣−9
I did it on khanacademy and i got it right
450 feet below sea level
The answer and explanation in the pic below
Good luck,!
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C