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Ray Of Light [21]
3 years ago
9

Independence probability question, please help

Mathematics
1 answer:
sleet_krkn [62]3 years ago
8 0
Whether the events are dependent or not, the rule for conditional probability applies:
  P(a|b) = P(a∩b)/P(b)
  P(a|b)×P(b) = P(a∩b)
  0.25×0.4 = P(a∩b) = 0.1

The appropriate choice is
  C. 0.1
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Answer:

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Step-by-step explanation:

√(-225) · √(-36) = (15i)·(6i) = 90i² = 90·(-1) = -90

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On the other hand, ...

... √(-225) · √(-36) = √((-225)·(-36)) = √8100 = 90

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If you consider all the roots at each stage, the result is ±90. Since you're working with complex numbers here, it is reasonable to recognize every number has two square roots.

... √(-225) = ±15i

... √(-36) = ±6i

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