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liraira [26]
3 years ago
5

Can someone explain this i got 2 but I am really confused help me pls

Mathematics
2 answers:
Assoli18 [71]3 years ago
7 0

Answer:

its either b or d im not sure sorry

Step-by-step explanation:

andreyandreev [35.5K]3 years ago
7 0

Answer:

<u>Answer</u><u>:</u><u> </u><u>x</u><u> </u><u>is</u><u> </u><u>2</u>

Step-by-step explanation:

0.3(12x - 16) = 0.4(12 - 3x)

open the brackets [ distributive property ]

3.6x - 4.8 = 4.8 - 1.2x

collect like terms together:

3.6x + 1.2x = 4.8 + 4.8

factorise out x :

x(3.6 + 1.2) = 4.8 + 4.8 \\ 4.8x = 9.6

divide by 4.8 on all sides:

\frac{4.8x}{4.8}  =  \frac{9.6}{4.8}  \\  \\ x = 2

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Lisa's store collects 5% sales tax on every item sold. If she collected $22.00 in sales tax, what was the cost of the items her
Ede4ka [16]
Since we are looking for the principal amount, then all we have to do is reverse the process of getting the amount of tax. In order to get the principal, you just have to divide 22 with 0.05. The answer is 440 so that is the principal amount you are looking for.
5 0
3 years ago
A government report gives a 99% confidence interval for the proportion of welfare recipients who have been receiving welfare ben
juin [17]

Answer:

The estimation for the proportion for this case is \hat p = 0.21

And we know that the 99% confidence interval is given by:

0.21 \pm 0.045

So then the margin of error at 99% of confidence is 0.045, and the margin of error is given by this formula:

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

If we decrease the confidence level this margin of error can't be higher than 0.045 so then the correct answer for this case would be:

d. 21% ± 4.8%

Because if the z value decrease from 2.58 to 1.96 not makes sense that the margin of error increase from 0.045(4.5%) to 0.048(4.8%)

Step-by-step explanation:

Previous concepts

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".  

Solution to the problem

The population proportion have the following distribution  

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

The confidence interval would be given by this formula  

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

For the 95% confidence interval the value of \alpha=1-0.95=0.05 and \alpha/2=0.025, with that value we can find the quantile required for the interval in the normal standard distribution.  

z_{\alpha/2}=1.96

For the 99% confidence interval the value of \alpha=1-0.99=0.01 and \alpha/2=0.005, with that value we can find the quantile required for the interval in the normal standard distribution.  

z_{\alpha/2}=2.58

The estimation for the proportion for this case is \hat p = 0.21

And we know that the 99% confidence interval is given by:

0.21 \pm 0.045

So then the margin of error at 99% of confidence is 0.045, and the margin of error is given by this formula:

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

If we decrease the confidence level this margin of error can't be higher than 0.045 so then the correct answer for this case would be:

d. 21% ± 4.8%

Because if the z value decrease from 2.58 to 1.96 not makes sense that the margin of error increase from 0.045(4.5%) to 0.048(4.8%)

5 0
3 years ago
Ayoooo please help What's the sum to 0. 061 + 0. 43<br><br><br> SHESHHHHHHHH
Irina18 [472]

Answer:

0.491

Step-by-step explanation:

8 0
2 years ago
5/3 dived by 3? Plz help
WINSTONCH [101]

Answer:

5/9 or 0.5

Step-by-step explanation:

i hope this helps :)

7 0
3 years ago
Read 2 more answers
Select the correct answer.
ch4aika [34]

Answer:

home inventory

Step-by-step explanation:

the insurance company wants to know what they are going to be insuring

4 0
3 years ago
Read 2 more answers
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