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Stels [109]
3 years ago
13

Please show work for the problem.

Mathematics
1 answer:
deff fn [24]3 years ago
5 0

Answer:

2 over 5 and negative 2 over 5

Step-by-step explanation:

4 - 25x power2 = 0

(left side) (right side)

first we let the 25 power 2 go to the right side because the 25x power 2 is negative form at left side so when it go to the right side it will become positive form, so :

4 = 25x power 2

now we let the 25 go back to the left side again and this time it will become :

4 over 25 = x power 2

and now we can let the power 2 go to the left side and it will become square root :

+ - √ 4 over 25 = x

at the end, you will get 2 answers which is 2 over 5 and negative 2 over 5.

<h3>Hope This Help ;)</h3>

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Answer:

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c) 0.0253

Step-by-step explanation:

Since the result of the test should be independent of the time , then the that the test number of times that test proves correct is independent of the days the river is correct .

denoting event a A=the test proves correct and B=the river is polluted

a) the test indicates pollution when

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then

P(test indicates pollution)= P(A)*P(B)+ (1-P(A))*(1-P(B)) = 0.12*0.84+0.88*0.16 = 0.2416

b) according to Bayes

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c) since

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the rate of false positives is

P(river is polluted/test indicates no pollution) = 0.12*0.16 / 0.7584 = 0.0253

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Step-by-step explanation:

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