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4 years ago

What is the root of 20

Mathematics

2 answers:

belka [17]4 years ago

6 0

1000000000000000000000000000

Basile [38]4 years ago

6 0

The square root of 20 = 4.472: The full number is 4.472135955

Enjoy your day, and hope it helps!

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This is my question, is 5/x a momomial?

Kaylis [27]

Answer:

It is not. 5 would be the momomial. Including the /x makes in not a monomial.

Step-by-step explanation:

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3 years ago

A line passes through the points (–5, 2) and (10, –1). Which is the equation of the line?

DiKsa [7]

If the line passes through the points (-5,2) and (10,-1), then the equation of the line will be y= -1/5x+1

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3 years ago

Solving Exponential and Logarithmic Equation In exercise,solve for x or t.See example 5 and 6.

nalin [4]

Answer:x=15

Step-by-step explanation:

You should collect the like terms first

21-6=x

Therefore

X=15

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3 years ago

A researcher wants to estimate the percentage of all adults that have used the Internet to seek pre-purchase information in the

lara31 [8.8K]

Answer:

The sample size is 1875.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Sampling error of 0.03.

This means that $M = 0.03$

99.74% confidence level

So $\alpha = 0.0026$ , z is the value of Z that has a pvalue of $1 - \frac{0.0026}{2} = 0.9987$ , so $Z = 3$ .

25% of all adults had used the Internet for such a purpose

This means that $\pi = 0.25$

What is the sample size

The sample size is n. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.03 = 3\sqrt{\frac{0.25*0.75}{n}}$

$0.03\sqrt{n} = 3\sqrt{0.25*0.75}$

Simplifying by 0.03 both sides

$\sqrt{n} = 100\sqrt{0.25*0.75}$

$(\sqrt{n})^2 = (100\sqrt{0.25*0.75})^2$

$n = 1875$

The sample size is 1875.

7 0

3 years ago

A multiple choice exam has 4 choices for each question. A student has studied enough so that the probability they will know the

Katena32 [7]

Answer:

probability that the student knew the answer given that he answered the question correctly is 0.7742 (77.42%)

Step-by-step explanation:

a student can get the question right in 3 ways:

- knowing the answer with probability 0.5

- eliminating one of the 4 choices and guessing with the remaining 3 with probability 0.25

- or guessing from the 4 choices with probability 0.25

then defining the event R= getting the answer right , we have

P(R)= probability of knowing the answer*probability of getting the question right if knowing the answer + probability of eliminating one answer* probability of getting the question right if eliminates one answer + probability of guessing the 4 choices * probability of getting the question right if guessing the 4 choices

thus

P(R)= 0.5*1 + 0.25* 1/3 + 0.25*1/4 = 0.6458

then we use conditional probability through the theorem of Bayes. Defining K= student knew the answer

then

P(K/R) = P(K∩R) /P(R) = 0.5*1/0.6458 = 0.7742 (77.42%)

where

P(K∩R) = probability that the student knew the answer and answers the question correctly

P(K/R)= probability that the student knew the answer given that he answered the question correctly

6 0

3 years ago