A submarine was seen at 80 feet below sea level. It ascends 250 feeet . What is its new position

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It is given that in the initial position of submarine was 80 ft below the sea level that means -80
Then it goes up or moves up +250 ft

Now we  have to find its new position
It is ( 250+ ( - 80)  ) = 170 ft above the sea level

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