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Nady [450]
2 years ago
14

What is the product? (2x - 1)(x+4) O 2x2-4 O 2x2 + 4 2x2 + 7 x-4 2x2 - 7x - 4

Mathematics
1 answer:
neonofarm [45]2 years ago
4 0

Answer:

,

Step-by-step explanation:

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This is how you solve it

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In a recent survey of 25 voters, 17 favor a new city regulation and 8 oppose it. What is the probability that in a random sample
Rasek [7]

Answer:

P(X=2)=(6C2)(0.68)^2 (1-0.68)^{6-2}=0.0727

Step-by-step explanation:

1) Previous concepts

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

2) Solution to the problem

The probability in favor of the regulation based on the recent survey is:

p = \frac{17}{25}=0.68

Let X the random variable of interest "Number of favor respondents about the regulation", on this case we now that:

X \sim Binom(n=6, p=0.68)

The probability mass function for the Binomial distribution is given as:

P(X)=(nCx)(p)^x (1-p)^{n-x}

Where (nCx) means combinatory and it's given by this formula:

nCx=\frac{n!}{(n-x)! x!}

And we want to find this probability:

P(X=2)=(6C2)(0.68)^2 (1-0.68)^{6-2}=0.0727

If we use X= "Number of respondednts opposed to the regulation we got the same answer", but on this case p = 1-0.68=0.32, and we want this probability:

P(X=4)=(6C4)(0.32)^4 (1-0.32)^{6-4}=0.0727

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Brianna has 0.15 liter of a liquid. She will use 0.4 of this liquid. How many liters will she use?
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Answer: 0.0375

Step-by-step explanation:

0.15 divided by 4 = 0.0375

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The speed of one type of bullet is 200 meters per second. How long would it take the bullet to travel 5,000 meters?
Pie
It would take the bullet 25 seconds to travel 5,000 meters (:
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3 years ago
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