Answer:
x=3
Step-by-step explanation:
6. 20 ft Below sea level is -20 and 15 ft. Below sea level is -15, add -20+-15 (the new integer is -35)
23/198 that is the simplified version
Answer: 
Step-by-step explanation:
This is a rectangle missing a piece which looks like a triangle.
Find the area of the rectangle and subtract the area of the triangle.
Rectangle:

Triangle:

Now subtract the area of the triangle from the area of the rectangle.

3. Divide by 5
4. Add 12
5. Multiplying by -8
6.subtracting by -6