Write an addition expression to describe the given situation. Then find the sum:
A submarine dives $35 m$ below the water. Then it rises $21 m e t r e s$ .

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Solution

We are given that,
Submarine dives by $35 m$ , means it goes down by $- 35 m$
Then, it rises by $21 m$ , means it goes up by $21 m$
The addition expression is $- 35 m + 21 m$
Thus, the final answer is $- 35 m + 21 m = - 7 m$

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