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3 years ago

Which fraction is equivalent to 9 12

Mathematics

2 answers:

WINSTONCH [101]3 years ago

5 0

Answer:

3/4

Step-by-step explanation:

So we know that 3/4 is equivalent to 9/12, because 3×12=36 and 4×9=36. A simple way to look at how to check for equivalent fractions is to do what is called “cross-multiply”, which means multiple the numerator of one fraction by the denominator of the other fraction

polet [3.4K]3 years ago

3 0

The equivalent is 3/4. It’s reduced.

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Please help me simplify this. Show work.

andreyandreev [35.5K]

The answer to the question

6 0

3 years ago

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

Writing to Explain In the equation x-3.5 = 7.2, why cant you just add 3.5 tonone side of the equation to get x alone? I'll give

valentinak56 [21]

Answer as follow: happy to help always.....

Step-by-step explanation:

x-3.5 = 7.2

x = 7.2+ 3.5

as you know that 3.5 is subtracting over other side while moving it on 7.2 side it will add..

7.2+3.5

10.7

so,

x= 10.7

you can check ✅✅✅✅

Thank you!!!!!!!!!

3 0

3 years ago

Fiona can make 8 cards in 1/2 hour. She divides to find the number of cards she can make per hour, but she makes a mistake. Thre

OlgaM077 [116]

Answer:

16 cards in 1 hour

Step-by-step explanation:

8 cards, 1/2 hour

16 cards in 1 hour

Make a proportion.

8/30min= x/60min

Solve the proportion by cross- multiplying.

30x=480

3x=48

x=16

6 0

3 years ago

For the sequence defined by a1=2<br><br> An+1=5/an-4

hichkok12 [17]

Answer:

i thnk is 239.213

Step-by-step explanation:

4 0

3 years ago