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astra-53 [7]
3 years ago
7

Simplify 3(x+2)-9x+5 A) -6x+11 B) 12x+7 C) 12x+11 D) -6x+7

Mathematics
1 answer:
olchik [2.2K]3 years ago
8 0
3 (x + 2) - 9x + 5 simplified would be A) -6x + 11
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You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estim
pogonyaev

Answer:

n=\frac{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36  

And rounded up we have that n=656

Step-by-step explanation:

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 80% of confidence, our significance level would be given by \alpha=1-0.80=0.20 and \alpha/2 =0.10. And the critical value would be given by:

z_{\alpha/2}=\pm 1.28

Solution to the problem

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)  

Since we don't have prior info for the proportion of interest we can use \hat p=0.5 as estimator. And on this case we have that ME =\pm 0.025 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{0.5(1-0.5)}{(\frac{0.025}{1.28})^2}=655.36  

And rounded up we have that n=656

5 0
3 years ago
Can u help? this is due in an hour
Marysya12 [62]

Answer:

<em> 4 pairs of earrings </em>

Step-by-step explanation:

3.75 e + 9.50 < 25

3.75 e < 25 - 9.50 = 15.50

e < 15.50 ÷ 3.75 ≈ 4.13

e =<em> 4 pairs of earrings</em>

3 0
2 years ago
If you can answer both of these i'll give brainliest
Anna35 [415]

Answer:

1. 30x + 20

2. -10x + 60

Step-by-step explanation:

3 0
2 years ago
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Really really need help on ONE math graph question.
Nat2105 [25]
The answer is      -3.5, 0.5
7 0
3 years ago
Which is bigger 40% of 120 or 1/4 of 200?
Dmitry [639]
40/100×120=4/1×12=48. 1/4×200=50. so 1/4 of 200 is greater than 40% of 120.
8 0
3 years ago
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