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Vilka [71]
2 years ago
8

Question 2 of 10

Mathematics
1 answer:
Veronika [31]2 years ago
8 0

Answer:

D

Step-by-step explanation:

Use the general formula of quadratic equation:

x_{1,2}=\dfrac{-b \pm\sqrt{b^2-4ac}  }{2a} = \dfrac{6\pm\sqrt{36-40}}{4}=\dfrac{6\pm2i}{4} = \dfrac{3\pm i}{2}

Thus we choose D

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The security system in a house has two units that set off an alarm when motion is detected. Neither one is entirely reliable, bu
Mariulka [41]

Answer:

Probability that detector B goes off is '0.615'

Step-by-step explanation:

Given that:

1) Probability that detector A goes off and detector B does not go off is 0.25.

2)Probability that detector A does not go off is 0.35.

3)Probability that detector A  goes off is (1-0.35)=0.65

Assuming that

Probability that detector B goes off is 'p' Hence the probability that detector B does not goes off  is (1-p)

Thus the probability that detector A goes off and detector B does not go off is  product of the individual probabilities

P(E)=0.65\times (1-p)\\\\0.65\times (1-p)=0.25\\\\0.65-0.65p=0.25\\\\0.65-0.25=0.65p\\\\\therefore p=\frac{0.40}{0.65}=0.615

Probability that detector B goes off is '0.615'

5 0
3 years ago
How do you divide 100.5/1.5
aivan3 [116]
Divide 100.5 by 1.5 to get 67.67
7 0
3 years ago
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2x + 5 =12<br> What is x
lisabon 2012 [21]

Answer:

7/2

Step-by-step explanation:

2x=12-5....collectible like terms

2x=7

x=7/2...dividing both side by 2

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171 miles in 3 hours as a unit rate
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57 m/h or mph
171 divided by 3 is 57
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3 years ago
668,126,826<br> - 424,102,320
stiv31 [10]

Answer:

244,024,506

Step-by-step explanation:

have a great day :)

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