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Bad White [126]
3 years ago
15

100 POINTS 10 QUESTIONS PLEASE HELP PICTURES BELOW PLEASE SPECIFY WHICH QUESTION YOU ARE ANSWERING

Mathematics
2 answers:
Semenov [28]3 years ago
8 0

Answer:

The answers are \frac{2}{5}, \frac{1}{4}, \frac{1}{10}, \frac{5}{2}, \frac{5}{8}, \frac{4}{1}, \frac{8}{5}, and \frac{10}{1}.

Step-by-step explanation:

Proportions are fractions that can be made by using the given numbers, which in this case are 2, 5, 8, and 20. Let's pair each one with the other three and then simplify if possible.

First, let's begin with 2:

\frac{2}{5} = \frac{2}{5}

\frac{2}{8} = \frac{1}{4}

\frac{2}{20} = \frac{1}{10}

Then, let's do 5:

\frac{5}{2} = \frac{5}{2}

\frac{5}{8} = \frac{5}{8}

\frac{5}{20} = \frac{1}{4}

Note that we already have \frac{1}{4}, so we do not need to include an additional one.

Now, let us do 8:

\frac{8}{2} = \frac{4}{1}

\frac{8}{5} = \frac{8}{5}

\frac{8}{20} = \frac{2}{5}

See how we already have \frac{2}{5}, so we won't have to include that as well.

Finally, let's do 20:

\frac{20}{2} = \frac{10}{1}

\frac{20}{5} = \frac{4}{1}

\frac{20}{8} = \frac{5}{2}

Now see that we already have both \frac{4}{1} and \frac{5}{2}, so we won't have to include both of them, as they are both extras.

Hence, the answers are \frac{2}{5}, \frac{1}{4}, \frac{1}{10}, \frac{5}{2}, \frac{5}{8}, \frac{4}{1}, \frac{8}{5}, and \frac{10}{1}.

<h2><u><em>PLEASE MARK AS BRAINLIEST!!!!!</em></u></h2>
Neko [114]3 years ago
6 0
I could only get the last one. 1/10 is the only one a can rule out sorry I really did my best.
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If B represents the event that a 3 is rolled on a 6-sided die, then what statement best describes B?
olga nikolaevna [1]

Answer:

1/6 chance

Step-by-step explanation:

a six sided die has 6 numbers, there is an equal chance that any of them can be rolled. 3 is one of those numbers. B=1/6 chance

8 0
3 years ago
Find the 90% confidence interval for the population standard deviation given the following.
lions [1.4K]

Answer:

b. 2.01 < σ < 2.81

Step-by-step explanation:

The 90% confidence interval for the population standard deviation is calculated as:

\sqrt{\frac{(n-1)*s^{2} }{X^2_{\alpha/2 } } }    < σ < \sqrt{\frac{(n-1)*s^{2} }{X^2_{1-\alpha/2 } } }

Where n is equal to 51, s is equal to 2.34, \alpha is 10%, X^{2} _{\alpha /2} is the value for the Chi squared distribution with n-1 degrees of freedom that has a probability of \alpha /2 in the right tail and X^{2} _{1-\alpha /2} is the value for the Chi squared distribution with n-1 degrees of freedom that has a probability of 1-\alpha /2 in the right tail.

So, replacing n by 51, s by 2.34, X^{2} _{\alpha /2} by 67.50 and X^{2} _{1-\alpha /2} by 34.76, we get that the The 90% confidence interval is equal to:

\sqrt{\frac{(51-1)*2.34^{2} }{67.50} } } < σ <\sqrt{\frac{(51-1)*2.34^{2} }{34.76} } }

2.01 < σ < 2.81

5 0
3 years ago
25 is what percent of 20?
denis-greek [22]

Answer:

20 is 80% of 25

Step-by-step explanation:

We assume, that the number 25 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 100% equals 25, so we can write it down as 100%=25.

4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.

5. Now we have two simple equations:

1) 100%=25

2) x%=20

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

100%/x%=25/20

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20 is what percent of 25

100%/x%=25/20

(100/x)*x=(25/20)*x       - we multiply both sides of the equation by x

100=1.25*x       - we divide both sides of the equation by (1.25) to get x

100/1.25=x

80=x

x=80

8 0
2 years ago
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e-lub [12.9K]

Answer:

? = 13

Step-by-step explanation:

Using Pythagoras' identity in the right triangle

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? = \sqrt{169} = 13

4 0
3 years ago
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1 year ago
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