It started at 152 feet below sea level( or -152 feet), then was instructed to rise 63 feet. That would bring it to 89 feet. Then to fall 84 would leave it at 173 feet below sea level(or -173 feet)
g(x) = f(x) + 9 shifts it up 9 units.
g(x) = f(x+2) shifts it left 2 units.
g(x) = -f(x) reflects it across the x-axis.
It looks like you may want
... g(x) = -(f(x+2) +9) . . . . . shifted up, then reflected

The answer is y = -3x + 11, if you plug in a few examples it works.
Use Heron's Formula:
s means semi-perimeter = (50 + 31 + 18) / 2 = 99 / 2 =
49.5
area = sq root [(s * (s-a) * (s-b) * (s-c)]
area = sq root [(49.5 * (s-a) * (s-b) * (s-c)]
This will NOT form a triangle. The longest side (50) is greater than the sum of the other 2 sides.
Source:
http://www.1728.org/trianinq.htm
The answer is 4. I but it has to be capital