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dusya [7]
2 years ago
10

Evaluate 2xy when x=-1/4and y=3

Mathematics
1 answer:
Yanka [14]2 years ago
7 0

Answer:

see above

.............

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faltersainse [42]
The answer is 3√5. You use the distance formula: √((x2-x1)^2+(y2-y1)^2)
3 0
3 years ago
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A fish tank in a pet store has 23 fish in it. 10 are orange and 13 are white. Determine the probability that if we select 4 fish
Gala2k [10]

Answer:

ok so the probility of gettting one white fish is

13/23

and if we take out one white fish the problity is

12/22

so we just multiply

12/22*13/23=0.30830039525

so the problity is 0.30 if you choose two fish you will get white for both

3 0
2 years ago
The test to detect the presence of respiratory syncytial virus is 97% accurate for a person who has the virus and 99% accurate f
Setler79 [48]

Answer:

The probability that a randomly selected person gets incorrect result is 2.2 × 10⁻⁴

Step-by-step explanation:

The parameters given are;

The accuracy of the test for a person who has the respiratory synctial virus = 97%

The accuracy of the test for a person who does not have the respiratory synctial virus = 99%

We have;

a = TP =

b = FP

c = FN

d = TN

a/(a + c) = 0.97

d/(d + b) = 0.99

a/(a + b) = 0.97*0.0055/(0.97*0.0055 + (1 - 0.99)*(1-0.0055))

PPV = 0.349 = 34.9%

Therefore, we have;

a/(a + c) = 0.97 and

a/(a + b)  =  0.349

0.97(a + c) =0.349(a + b)

(0.97 - 0.349)a = 0.349·b - 0.97·c

a = (0.349·b - 0.97·c)0.621

b × (1 - 0.0055) = (1 - 0.97)×(1 - 0.0055)

b = 1 - 0.97 = 0.03

Similarly,

c = 1 - 0.99 = 0.01

The proportion of the population that have false positive and false negative = 0.03 + 0.01 = 0.04 = 4%

The probability that a randomly selected person gets incorrect result = 0.04×0.0055 = 0.00022.

5 0
2 years ago
What is 42 x 3? (try to not use a calculator though) I don't actually need this to be solved but, I want to see if you guys can
laila [671]

Answer:

126

Step-by-step explanation:

42 times 3 = 126

6 0
2 years ago
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Mitchell has $180 in a savings account that earns 10% simple interest annually. How much interest will he earn in 2 years?
Mrrafil [7]

Answer:

36.00

Step-by-step explanation:

7 0
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