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Assoli18 [71]
3 years ago
12

Your friend incorrectly factors the expression 15x — 20xy as 5x(3— 4xy

Mathematics
1 answer:
nika2105 [10]3 years ago
6 0

Answer:

no 15x — 20xy as 5x(3— 4xy is not correct

Step-by-step explanation:

15x — 20xy ≠ 5x(3— 4xy)

there are not equal because 5x(3 - 4xy) =

when you simplify the bracket, you will have

15x - 20x²y

You might be interested in
Which set of ordered pairs represents a function?
finlep [7]

Answer:

{(-1,0),(-8, 9), (7,0), (1,3)}

Step-by-step explanation:

number 3 is the only one with no colliding outputs.

6 0
2 years ago
In a survey, the planning value for the population proportion is . How large a sample should be taken to provide a confidence in
tatuchka [14]

Answer:

n=350

Step-by-step explanation:

Notation and definitions

n random sample taken  (variable of interest)

\hat p=0.35 estimated proportion  (value assumed)

p true population proportion

Confidence =0.95 or 95% (value assumed)

Me=0.05 (value assumed)

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".  

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

The population proportion have the following distribution

p \sim N(p,\sqrt{\frac{\hat p(1-\hat p)}{n}})

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by \alpha=1-0.95=0.05 and \alpha/2 =0.025. And the critical value would be given by:

z_{\alpha/2}=-1.96, z_{1-\alpha/2}=1.96

The margin of error for the proportion interval is given by this formula:  

ME=z_{\alpha/2}\sqrt{\frac{\hat p (1-\hat p)}{n}}    (a)  

And on this case we have that ME =\pm 0.05 and we are interested in order to find the value of n, if we solve n from equation (a) we got:  

n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}   (b)  

And replacing into equation (b) the values from part a we got:

n=\frac{0.35(1-0.35)}{(\frac{0.05}{1.96})^2}=349.586  

And rounded up we have that n=350

4 0
2 years ago
Anybody know how to do this ​
ICE Princess25 [194]

Answer:

y = 2

y = 4

y = 8

y = 2

y = 3

y = 6

3 0
3 years ago
Read 2 more answers
Which of the four is it? ​
Anna11 [10]

Answer:

option 1 i believe

Step-by-step explanation:

just worked it out

i hope this is right and helps <3

6 0
3 years ago
What is between 280 and 560?
nikitadnepr [17]
420 would be the middle number.

Hoped I Could Help:)
3 0
2 years ago
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