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A submarine at -28 feet dives to 40 feet. What is the submarine's elevation after the dive?

1. 68 feet
2. 12 feet
3. -12 feet
4. -68 feet

Answer :

Final answer:

The submarine initially at -28 feet dives an extra 40 feet, leads to a total depth of -68 feet below sea level. Hence, its final elevation is -68 feet.

Explanation:

The question asks about the final elevation of a submarine after a dive. The submarine initially resides at a depth of -28 feet, and it subsequently dives another 40 feet deeper. To calculate the final position or 'elevation' of the submarine, we would sum these two amounts.

This task needs a basic understanding of the number line and how to add and subtract positive and negative numbers. It's crucial to remember that on a number line, moving to the right means adding and moving to the left means subtracting. When we discuss elevation, above sea level is positive, while below sea level is negative.

So in this scenario, adding -28 feet (the initial depth) and -40 feet (the additional dive depth), we receive a total depth of -68 feet, which represents the submarine's final elevation in relation to sea level. This means option 4 is the correct answer.

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