Not so sure.. but I got 9.6 meters below water level.
Expression simplified: 
Step-by-step explanation:
The expression that we have in this problem is:

The first type of operation that we have to solve in such expression are multiplication/division.
In this expression, there is only one multiplication, that is:

So we can rewrite the expression as

Now we can evaluate the sum of the similar terms: in this case, similar terms are only 3 and 4, and their sum is

Therefore, the expression can be rewritten as

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So basically isolate the X
4x>32
Divide both sides by 4
X> 8
unshaded dot on 8, pointing to the left
BD = 46
Explanation:
BC = CD and AC is used for both triangles so AD MUST = AB.
If AB = 23, then AD = 23.
BD = AB + AB
BD = 23 + 23
BD = 46
Answer:
you need to 12 minus 5b9 as base and don’t forget to mention the integer