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A submarine descends 8 m each minute for 5 minutes, then rises 6 m each minute for 3 minutes, starting at sea level (0).
Using properties of integers to organise the calculation, at what depth (as an integer) is it finally?

Class 7Properties of IntegersIntegers
  • A-20
  • B-44
  • C-24
  • D-22

Step-by-Step Solution

Descent: . Ascent: . Final = , i.e. 22 m below sea level.
Answer: D) -22

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