Step-by-step explanation:
1. 400 feet below sea level
- Representation: -400 ft
- Opposite of the situation: 400 feet above sea level
- Representation: +400 ft
2. 2 steps forward
- Representation: +2 steps
- Opposite of the situation: 2 steps backwards
- Representation: -2 steps
3. Going up the stairs by 8 steps
- Representation: +8 steps
- Opposite of the situation: Going down the stairs by 8 steps
- Representation: -8 steps
4. Marching 12 steps to the right
- Representation: +12 steps
- Opposite of the situation: Marching 12 steps to the left
- Representation: -12 steps
5. A profit of ₱450
- Representation: +₱450
- Opposite of the situation: A loss of ₱450
- Representation: -₱450
6. Walking 5 blocks south
- Representation: +5 blocks
- Opposite of the situation: Walking 5 blocks north
- Representation: -5 blocks
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