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seropon [69]
3 years ago
14

7x-3y = 10-3x-8y= 5​

Mathematics
1 answer:
victus00 [196]3 years ago
6 0
My answer would be y=-1
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Show how to use known facts to find 6x9. Explain how you chose the facts you did
antoniya [11.8K]
<span>The x in this problem represents multiplication, or finding the product of the two numbers. In this case, this problem represents six multiplied nine times, or adding the number six nine times. So the number six added to the number six a total of nine times is fifty-four.</span>
7 0
3 years ago
Evaluate N^2 + 2N 1 for N=5
Murljashka [212]

Answer:

35

Step-by-step explanation:

write 5 in N's place

5^2+2×5×1

25+10

35

8 0
3 years ago
What is a necessary step for constructing perpendicular lines through a point on a line?
maxonik [38]

Answer:

Edit: This is incorrect, it might actually be the 3rd answer, draw arcs on either side of a given point on the line?

Draw arcs on either side of a given point off of the line I believe.

Step-by-step explanation:

Bisect a Segment:

Step 1 - open up your compass so that it is slightly larger than the segment. Put the compass on point A on the given segment and swing an arc above and below the lines. Do the same on point B. Create the points where the circle intersects.

Step 2 - Draw a line going through the points. That’s the bisector.

6 0
3 years ago
Read 2 more answers
3/4 is equal to how many 84ths? Explain please!
frutty [35]
It is just asking for you to convert 3/4 in 84ths. This means it wants the denominator to be 84. So multiply both the top and bottom by what gets you 84. In this case, multiply both by 21. So 3/4•(21/21)=63/84
6 0
3 years ago
Read 2 more answers
A machine that puts corn flakes into boxes is adjusted to put an average of 15.6 ounces into each box, with standard deviation o
Anastaziya [24]

Answer:

\chi^2 =\frac{15-1}{0.0676} 0.1521 =31.5

p_v =P(\chi^2_{14} >31.5)=0.0047

If we compare the p value and the significance level assumed of 0.05 we see that p_v so on this case we have enough evidence in order to reject the null hypothesis at the significance level provided. And that means that the population variance is significantly higher than 0.26^2=0.0676.

Step-by-step explanation:

Notation and previous concepts

A chi-square test is "used to test if the variance of a population is equal to a specified value. This test can be either a two-sided test or a one-sided test. The two-sided version tests against the alternative that the true variance is either less than or greater than the specified value"

n=15 represent the sample size

\alpha represent the confidence level  

s^2 =0.39^2 =0.1521 represent the sample variance obtained

\sigma^2_0 =0.26^2 =0.0676 represent the value that we want to test

Null and alternative hypothesis

On this case we want to check if the population variance specification is violated, so the system of hypothesis would be:

Null Hypothesis: \sigma^2 \leq 0.0676

Alternative hypothesis: \sigma^2 >0.0676

Calculate the statistic  

For this test we can use the following statistic:

\chi^2 =\frac{n-1}{\sigma^2_0} s^2

And this statistic is distributed chi square with n-1 degrees of freedom. We have eveything to replace.

\chi^2 =\frac{15-1}{0.0676} 0.1521 =31.5

Calculate the p value

In order to calculate the p value we need to have in count the degrees of freedom , on this case df=15-1=14. And since is a right tailed test the p value would be given by:

p_v =P(\chi^2_{14} >31.5)=0.0047

In order to find the p value we can use the following code in excel:

"=1-CHISQ.DIST(31.5,14,TRUE)"

Conclusion

If we compare the p value and the significance level assumed of 0.05 we see that p_v so on this case we have enough evidence in order to reject the null hypothesis at the significance level provided. And that means that the population variance is significantly higher than 0.26^2=0.0676.

4 0
3 years ago
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