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3 years ago

Help meeeeeEEEEEEEEEEEEEEEEEEE

Mathematics

2 answers:

Margaret [11]3 years ago

8 0

Answer:

1.2

Step-by-step explanation:

0.12 looks like the correct answer but its not because if you look at the problem its 0.2 and 0.12 is smaller than 0.2 so its 1.2 because 0.2 x 6 = 1.2

Hope this helps! Please tell me any questions or concerns in the comments! Byeee <3

solmaris [256]3 years ago

4 0

Answer:

1.2

Step-by-step explanation:

0.2 x 6 = 1.2

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A rectangle has a perimeter of 26 feet. Twice its length (l) is one foot more than three times its width (w). What is the length

dimaraw [331]

Answer:

C. 8

Step-by-step explanation:

Divide the length by 2, then subtract by 1, then divide again by 3. multiply by 2 and add the original multiplied by 2 and hope its 26.

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3 years ago

What is 7x plus 3x plus5

Makovka662 [10]

10x + 5
Or 5(2x + 1)

Hope this helps!! Let me know if you have ANY questions.

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3 years ago

Read 2 more answers

Nitrates are groundwater contaminants derived from fertilizer, septic tank seepage and other sewage. Nitrate poisoning is partic

o-na [289]

Answer:

a) $n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.96})^2}=2401$

And rounded up we have that n=2401

b) $n=\frac{0.07(1-0.07)}{(\frac{0.02}{1.96})^2}=625.22$

And rounded up we have that n=626

And we see that if we have previous info about p the sample size varies a lot.

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

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:

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

Part a

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 $ME =\pm 0.02$ 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)

Since we don't have prior information about the population proportion we can use ase estimator $\hat p =0.5$ . And replacing into equation (b) the values from part a we got:

$n=\frac{0.5(1-0.5)}{(\frac{0.02}{1.96})^2}=2401$

And rounded up we have that n=2401

Part b

For thi case the estimator for p is $\hat p =0.07$

$n=\frac{0.07(1-0.07)}{(\frac{0.02}{1.96})^2}=625.22$

And rounded up we have that n=626

And we see that if we have previous info about p the sample size varies a lot.

4 0

3 years ago

1. -88 = -3(4m + 5) - (1 - 3m)

Vadim26 [7]

Answer:

m=8

Step-by-step explanation:

-88=-3(4m+5)-(1-3m)

-88=-12m-15-(1-3m) <- Distributive Property

-88=-12m-15-1+3m <- Open () if there is a negative negative the symbol equals positive

-88=-9m-16 <- Simplify

0=-9m+72 <- Add 88 to both sides

9m = 72 <- Add 9m to both sides

9m = 72

/9 /9

m=8

6 0

3 years ago

Is 25 – 4x = 15 – 3x + 10 – x and 4x + 8 = 2x + 7 + 2x - 20 a contradiction or identity?

SVEN [57.7K]

Answer:

i am not clear about questions nicely

3 0

3 years ago