Answer:
1+1=2-1=1
Step-by-step explanation:
lol, this is the hardest question I've done today.
Answer:
First option
Step-by-step explanation:

Answer:
58
Step-by-step explanation:
The submarine is below the sea level by 40 meters. Then, it goes up by 12. That means 40-12=28. The submarine goes 30m down again which means 28+30=58
check the picture below.
so, we know the dimensions of the pool, is a 20x10, so its area is simply 200 ft², and we know the walkway is 216 ft², so the whole thing, including pool and walkway is really 200 + 216 ft².
now, as you see in the picture, the dimensions for the combined area is 20+2x and 10+2x, since the walkway is "x" long, therefore,

notice, it cannot be -18, since is a positive length unit.
Each side has own formula, so which side is X