Question

Laurie was scuba diving. Each time she dove 5 feet deeper, she would stop and clear her ears. Each time that this totaled 20 feet deeper, she would stop and check her instruments to make sure they were working properly. After Laurie had checked her instruments 3 times, she was at her maximum depth. Which expression best represents Laurie’s maximum depth?
A: (4)(-5)(3)
B: (-4)(-5)(-3)
C: (-5)(20)(3)
D: (-5)(-20)(-3)

Answer 1

You could compute it based on the given information as (-20)(3). The next best choice is ...
  A: (4)(-5)(3)

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There is nothing in the problem statement that specfically says after 4 stops she checks her instruments. You have to figure that from -20/-5. That is why I would skip that step and go directly to (-20)(3).

Answer 2

C because shes going deeper which is down so negattive