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lisov135 [29]
3 years ago
12

RIGHT ANSWER WILL BE BRAINLIEST!!

Mathematics
2 answers:
Juli2301 [7.4K]3 years ago
4 0

Answer:

D. –20x + 48

Step-by-step explanation:

–4(5x – 12)

= (-4) (5x) - (-4)(12)

= -20x - (-48)

= -20x + 48

Julli [10]3 years ago
3 0

Answer:

The answer to your question is: letter D

Step-by-step explanation:

Simplify                                - 4 (5x - 12)

Just multiply each term by - 4

                                            - 4(5x) -4(-12)

                                           - 20 x + 48                                            

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3. Using the sample size of 800 and the proportion 0.47, calculate the margin of error associated with the estimate of the propo
salantis [7]

Answer:

ME=1.96\sqrt{\frac{0.47 (1-0.47)}{800}}=0.0346  

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".  

The population proportion have the following distribution

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

Solution to the problem

We assume for this case a confidence level of 95%. 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

The confidence interval for the mean is given by the following formula:  

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

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 if we replace the values obtained we got this:

ME=1.96\sqrt{\frac{0.47 (1-0.47)}{800}}=0.0346  

6 0
2 years ago
A spinner has 10 equal sections marked 1 through 10. You spin and land on a number
kumpel [21]

Answer:

100% chance of this happening.

Step-by-step explanation:

The chances of this happening = 100% because all the numbers are greater than 0.

7 0
2 years ago
Read 2 more answers
Please help me anyone
Alchen [17]

Answer:

the third one

Step-by-step explanation:

5.26 is less than 5.4

4 0
2 years ago
Read 2 more answers
What are the number of integral solutions of the equation 2x+2y+z=20 such that x>=0 , y>=0 , z>=0?
zaharov [31]
2x+2y+z=20\\
z=\dfrac{20}{2x+2y}\\
z=\dfrac{10}{x+y}

Now, for z to be an integer, the sum x+y must be a divisor of 10. 
It has to be a positive divisor since z≥0. Also x≠y.

x+y=1 \\
x=1-y\\

x≥0 and y≥0 so y can be equal to either 0 or 1. There are 2 solution in this case.

x+y=2\\
x=2-y\\
In this case, y can be equal to 0,1, or 2, but for y=1 ⇒ x=1, so there are two solutions.

x+y=5\\
x=5-y
y can be 0,1,2,3,4 or 5 - 6 solutions

x+y=10\\
x=10-y
y can be 0,1,2,3,4,5,6,7,8,9,10, but for y=5 ⇒ x=5, so 10 solutions.

2+2+6+10=20 solutions in total.
6 0
3 years ago
What is the area of a circle with a radius of 13 millimeters? <br> (Use 3.14 for Pi.)
ludmilkaskok [199]
The area of a circle with radius of 13 millimeters is A≈530.93A=πr2=π·132≈530.92916
5 0
3 years ago
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