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vampirchik [111]
3 years ago
5

Which is the distance between the point with the coordinates (-2,3) and the line with the equation 6x-y=-3

Mathematics
1 answer:
harina [27]3 years ago
8 0

Answer:

1.97 units

Step-by-step explanation:

The distance from a point (h,k) to a line ax+by+c=0 is given by:

d=\frac{|ah+bk+c|}{\sqrt{a^2+b^2} }

The given line is 6x-y=-3. or 6x-y+3=0.

This implies that: a=6, b=-1 and c=3

The given point is (-2,3)

This implies that: h=-2 and k=3

We substitute into the formula to get:

d=\frac{|6(-2)+-1(3)+3|}{\sqrt{6^2+(-1)^2} }

d=\frac{|-12-3+3|}{\sqrt{36+1} }

d=\frac{12}{\sqrt{37} }

d=1.97

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the midpoint of gh is m 5, 3. one endpoint is g 1, -5. find the coordinates of the other endpoint h.
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Since m is the midpoint of gh, both of the x, y coordinates of m should be the average of that of g and h. Let h=(x,y). 5=(1+x)/2, x=2*5-1=9; 3=(-5+y)/2, y=2*3-(-5)=11. So h(9,11).
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Step-by-step explanation:

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What is the image of (-1,-5) after a dilation by a scale factor of 5 centered at the<br> origin?
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Convert 6 4/5 to an improper fraction.
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7 0
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Scores on the SAT Mathematics test are believed to be normally distributed. The scores of a simple random sample of five student
AysviL [449]

Answer:

The mean calculated for this case is \bar X=584

And the 95% confidence interval is given by:

584-2.776\frac{86.776}{\sqrt{5}}=476.271    

584+2.776\frac{86.776}{\sqrt{5}}=691.729    

So on this case the 95% confidence interval would be given by (476.271;691.729)    

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".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Solution to the problem

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

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

In order to calculate the mean and the sample deviation we can use the following formulas:  

\bar X= \sum_{i=1}^n \frac{x_i}{n} (2)  

s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}} (3)  

The mean calculated for this case is \bar X=584

The sample deviation calculated s=86.776

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=5-1=4

Since the Confidence is 0.95 or 95%, the value of \alpha=0.05 and \alpha/2 =0.025, and we can use excel, a calculator or a tabel to find the critical value. The excel command would be: "=-T.INV(0.025,4)".And we see that t_{\alpha/2}=2.776

Now we have everything in order to replace into formula (1):

584-2.776\frac{86.776}{\sqrt{5}}=476.271    

584+2.776\frac{86.776}{\sqrt{5}}=691.729    

So on this case the 95% confidence interval would be given by (476.271;691.729)    

3 0
2 years ago
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