Math 6

Question Analysis
This question tests the understanding of adding a negative number to another negative number in a real-world context, such as the depth of a submarine.

Key Concept Explanation
When adding two negative integers, we can think of it as combining two amounts of “debt” or “shortage”.
The rule is to add the magnitudes of the two negative numbers and then attach a negative sign to the sum.
In other words, we are aggregating the “negativeness” of the two values. For example, .

Step-by-step Solution
1. Identify the depths: The initial depth is meters, and the additional descent is meters.
2. Add the magnitudes of the two negative numbers: The values are

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