Depth and height changes
Think of a number line. Moving up adds, and moving down subtracts.
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A submarine is at 19 m (below sea level means negative). It rises 1 m. What is its new position in metres?
Answer: 20
A submarine is at 19 m (below sea level means negative). It rises 10 m. What is its new position in metres?
Answer: 29
A submarine is at 16 m (below sea level means negative). It dives 3 m. What is its new position in metres?
Answer: 13
Tip: Think of a number line. Moving up adds, and moving down subtracts.
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