# Question #8c623

Dec 2, 2017

It levels out at $965$ feet below sea level.

#### Explanation:

First, let’s define below sea level as having a negative value.

So,

$150$ feet below sea level $\setminus \implies \setminus \quad - 150$ feet

That’s the starting point. Since the sub descends $850$ feet, that’s going to be a negative value.

So the sub is currently at $- 150 - 850$ feet, which is $- 1000$ feet.

If it rises $35$ feet, that’s positive.

So the sub is now at $- 1000 + 35$ feet, which is $- 965$ feet.

$\setminus \therefore$ the sub levels out at $965$ feet below sea level.