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Zina [86]
3 years ago
15

Find the solution of the equation x^2-4x-5=0

Mathematics
1 answer:
Virty [35]3 years ago
8 0

Answer:

x=5   and x=-1

Step-by-step explanation:

We can factor this equation

x^2-4x-5=0

(x-5) (x+1) = 0

We can use the zero product property

(x-5) =0   and (x+1) =0

x=5   and x=-1

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Answer:

82 {units}^{2}

Step-by-step

explanation

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3 years ago
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3 years ago
Past records indicate that the probability of online retail orders that turn out to be fraudulent is 0.08. Suppose that, on a gi
Sunny_sXe [5.5K]

Answer:

The probability that there are 2 or more fraudulent online retail orders in the sample is 0.483.

Step-by-step explanation:

We can model this with a binomial random variable, with sample size n=20 and probability of success p=0.08.

The probability of k online retail orders that turn out to be fraudulent in the sample is:

P(x=k)=\dbinom{n}{k}p^k(1-p)^{n-k}=\dbinom{20}{k}\cdot0.08^k\cdot0.92^{20-k}

We have to calculate the probability that 2 or more online retail orders that turn out to be fraudulent. This can be calculated as:

P(x\geq2)=1-[P(x=0)+P(x=1)]\\\\\\P(x=0)=\dbinom{20}{0}\cdot0.08^{0}\cdot0.92^{20}=1\cdot1\cdot0.189=0.189\\\\\\P(x=1)=\dbinom{20}{1}\cdot0.08^{1}\cdot0.92^{19}=20\cdot0.08\cdot0.205=0.328\\\\\\\\P(x\geq2)=1-[0.189+0.328]\\\\P(x\geq2)=1-0.517=0.483

The probability that there are 2 or more fraudulent online retail orders in the sample is 0.483.

5 0
4 years ago
Does anybody know the answer??
Marizza181 [45]

Answer:

Step-by-step explanation:

It A because they are both parallel.

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3 years ago
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Leona [35]

Hello!


We know that, in terms of radians and degrees, that an angle that turns through the entirety of a circle is 360 degrees. To find 1/3 of it, we just multiply by 1/3.


360(1/3)=120


Therefore, our answer is 120°.


I hope this helps!

6 0
3 years ago
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