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oksano4ka [1.4K]
4 years ago
7

PLEASE HELP!!! ILL GIVE BRANLIEST *EXTRA POINTS* dont skip :((

Mathematics
1 answer:
never [62]4 years ago
5 0
A.) some irrational numbers are natural numbers.
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The graph represents a distribution of data.<br><br><br> What is the mean of the data?
Gnom [1K]
With this type of graph with is called a Symetric Distribution graph, the mean iin the middle of the graph. the answer to your question is 50 is your mean. (and 50 is also your median) 
3 0
3 years ago
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You are running a concession stand selling hot dogs and sodas. Each hot dog costs $2 and each soda costs $1. At the end of the n
amm1812

Answer:

see the explanation

The number of hot dogs that were sold is 15 and the the number of sodas that were sold is 75

Step-by-step explanation:

Let

x ---> the number of hot dogs that were sold

y ---> is the number of sodas that were sold

we know that

You sold a total of 90 hot dogs and sodas combined

so

x+y=90 ----> equation A

You made a total of $105

so

2x+y=105

isolate the variable y

y=105-2x ----> equation B

substitute equation B in equation A

x+(105-2x)=90

solve for x

x=105-90\\x=15

Find the value of y (equation B)

y=105-2(15)=75

therefore

The number of hot dogs that were sold is 15 and the the number of sodas that were sold is 75

4 0
3 years ago
A fourth grade class of 28 students is given a standardized math test. The mean score of the 12 boys is 25 with a standard devia
Mashcka [7]

Answer:

The standard error for the sampling distribution is 1.323.

Step-by-step explanation:

Let <em>X</em> = scores of girls and <em>Y</em> = scores of boys.

The information provided is:

\bar x=24\\s_{x}=4\\n_{x}=16\\\bar y=25\\s_{y}=3\\n_{y}=12

As the population standard deviations are not known, use a pooled standard deviation to estimate the standard error of the sampling distribution.

The formula of pooled standard deviation is:

S_{p}=\sqrt{\frac{s_{x}^{2}}{n_{x}^{2}}+\frac{s_{y}^{2}}{n_{y}^{2}}}

Compute the standard error for the sampling distribution as follows:

SE=\sqrt{\frac{s_{x}^{2}}{n_{x}^{2}}+\frac{s_{y}^{2}}{n_{y}^{2}}}=\sqrt{\frac{4^{2}}{16}+\frac{3^{2}}{12}}=\sqrt{1+\frac{9}{12}}=\sqrt{\frac{21}{12}}=1.323

Thus, the standard error for the sampling distribution is 1.323.

7 0
3 years ago
A rectangle has a width of 7.9ft and a perimeter of 27.2 Ft enter the length of the rectangle, in decimal form in the box
vodomira [7]
5.7 is the answer because if one side is 7.9 the parallel is the same a rectangle. The is you add those, you get 15.8. The equation now is 15.8+x=27.2. 27.2-15.8 is 11.4 which is then divided to find the two sides which makes them 5.7.

7 0
4 years ago
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Suppose theta= 11pi/12. How do you use the sum identity to find the exact value of sin theta?
SIZIF [17.4K]
The better way is, first we have to find the equivalent in degrees

2\pi=360\º

\frac{11\pi}{12}=345\º

now we can change this value to -15\º

how do we get an angle like this?!

30\º-45\º=-15\º

then

sin(30\º-45\º)=sin(30\º)*cos(45\º)-sin(45\º)*cos(30\º)

\begin{Bmatrix}sin(30\º)&=&\frac{1}{2}\\\\sin(45\º)&=&cos(45\º)&=&\frac{\sqrt{2}}{2}}\end{matrix}\\\\cos(30\º)&=&\frac{\sqrt{3}}{2}\end{matrix}

now we replace this values

sin(-15\º)=\frac{1}{2}*\frac{\sqrt{2}}{2}-\frac{\sqrt{2}}{2}*\frac{\sqrt{3}}{2}

sin(-15\º)=\frac{\sqrt{2}}{4}-\frac{\sqrt{6}}{4}

\boxed{\boxed{sin(-15\º)=sin(345\º)=\frac{\sqrt{2}-\sqrt{6}}{4}}}
4 0
3 years ago
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