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mihalych1998 [28]
3 years ago
10

What percentage of 40 is 12?

Mathematics
1 answer:
dimulka [17.4K]3 years ago
6 0

Answer:

12 is 3 percent of 40.

Step-by-step explanation:

If you divide 12 by 40, you get 0.3. 0.3 as a fraction is 3/100. So, it would be 3% of 100.

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Chase purchased a sweatshirt from the clearance rack. The price of the sweatshirt after the discount is represented by the expre
Black_prince [1.1K]

Answer:B(0.75+0.25)x

Step-by-step explanation:

Is a discount of 0.75 was given the d real value of the sweatshirt would be a whole number

Which is 1-0.75=0.25

6 0
3 years ago
The area of the triangle with sides 60 cm,100 cm and 140 cm is of the form 1500 square root x cm².
Ede4ka [16]

Answer:

150

Step-by-step explanation:

5 0
2 years ago
The Information Technology Department at a large university wishes to estimate the proportion of students living in the dormitor
nadya68 [22]

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

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 99% of confidence, our significance level would be given by \alpha=1-0.99=0.01 and \alpha/2 =0.005. And the critical value would be given by:

z_{\alpha/2}=-2.58, z_{1-\alpha/2}=2.58

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)  

We can use as an estimator for p \hat p =0.5. And replacing into equation (b) the values from part a we got:

n=\frac{0.5(1-0.5)}{(\frac{0.05}{1.96})^2}=384.16  

And rounded up we have that n=385

3 0
3 years ago
3 (3x-8)-x=10-5x+18 equal 3-x=2-2x+18
ryzh [129]

Answer:

3

Step-by-step explanation:

5 0
3 years ago
GE = 3x - 11 FD = 2.x Find GE<br>Can someone help me??​
11Alexandr11 [23.1K]

Answer:

22

Step-by-step explanation:

Given the following

GE = 3x - 11 FD = 2x

Let us assume GE is parallel to FD, hence GE = FD

3x - 11 = 2x

3x - 2x = 0+11

x = 11

Get GE

GE = 3x - 11

GE = 3(11)-11

GE= 33 - 11

GE = 22

Hence the length of GE is 22

3 0
2 years ago
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