Answer:at mariana trench
Step-by-step explanation:
A submarine is forty- five below the surface.
It descends 15 feet = 45+15
= 60
Then ascends 4 feet = 60-4
= 56
Then descends 20 feet = 56+(20)
= 76 feet below
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Answer:at mariana trench
Step-by-step explanation:
A submarine is forty- five below the surface.
It descends 15 feet = 45+15
= 60
Then ascends 4 feet = 60-4
= 56
Then descends 20 feet = 56+(20)
= 76 feet below