Answer:
20 + 10 = 30
30 - 12 = 18
18 + 5 = 23
His elevation is 23ft below the sea level
Answer: -23 feet to sea level
Explanation:
start with 0 (sea level)
he dives twenty, -20
he dives ten more, -20 - 10 = -30
he swims up twelve feet; -18
he goes down 5 more; -23 feet
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