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7nadin3 [17]
2 years ago
11

Point A has coordinates (7,2). Point B has coordinates (2,-10). Find the coordinates of point P that partition AB in the ratio o

f 5:1

Mathematics
2 answers:
aleksklad [387]2 years ago
4 0
You have to use section formula for internal division.

garik1379 [7]2 years ago
4 0

Answer:

(\frac{17}{6},-8).

Step-by-step explanation:

We have been given that point A has coordinates (7,2). Point B has coordinates (2,-10). We are asked to find the coordinates of point P that partition AB in the ratio of 5:1.

We will use segment formula to solve our given problem.

When a point M divides a segment internally in ratio m:n, the coordinates of point M are:

[x=\frac{mx_2+nx_1}{m+n},y=\frac{my_2+ny_1}{m+n}]

[x=\frac{5*2+1*7}{5+1},y=\frac{5*(-10)+1*2}{5+1}]

[x=\frac{10+7}{6},y=\frac{-50+2}{6}]

[x=\frac{17}{6},y=\frac{-48}{6}]

[x=\frac{17}{6},y=-8]

Therefore, the coordinates of point P would be (\frac{17}{6},-8).

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The manufacturer of a smart watch claims that individuals who pay attention to how many steps they take per day will inadvertent
goldenfox [79]

Here is the correct question.

The manufacturer of a smart watch claims that individuals who pay attention to how many steps they take per day will inadvertently take more steps per day than individuals who pay no attention to how many steps they take per day. To investigate this claim, the manufacturer conducts a study to estimate the difference in the mean number of steps taken by those that pay attention to how many steps they take per day and those that do not. To do so, 40 volunteers are recruited. Half of the volunteers are randomly assigned to receive a smart watch and are taught how to use it to track their steps. The other half of the volunteers are given a wristband to wear, but are not informed that the wristband is tracking their steps. The volunteers are monitored for 30 days. The mean and standard deviation of the number of steps taken per day are computed for each group. Here are the data:

                                           n                     \bar x                  S_x

Pay attention                    20                 10,244            1,580

Do not pay attention        20                 8.,648            2,350

Which of the following is a 99% confidence interval for the difference in the mean number of steps taken by all people like these that do and do not pay attention to the number of steps they take per day using df - 19 ?

(A)  \ 1596  \ \pm 2.861 \sqrt{ \dfrac{1580^2}{20} + \dfrac{2350^2}{20}}  \\  \\ \\ (B)  \ 1596  \ \pm 2.861 \sqrt{ \dfrac{1580^2}{20} - \dfrac{2350^2}{20}} \\ \\  \\ (C)  \ 1596   \pm 2.576  \sqrt{ \dfrac{1580^2}{20} + \dfrac{2350^2}{20}}  \\ \\  \\ (D) 1596 \pm 2.576 ( \dfrac{1580^2}{\sqrt{20}} + \dfrac{2350^2}{\sqrt{20}}) \\ \\ \\ (E) 1596 \pm 2.576 ( \dfrac{1580^2}{\sqrt{20}} -  \dfrac{2350^2}{\sqrt{20}})

Answer:

\mathbf{(A)  \ 1596  \ \pm 2.861 \sqrt{ \dfrac{1580^2}{20} + \dfrac{2350^2}{20}}}

Step-by-step explanation:

Given that :

significance level \alpha = \mathbf{0.01}

From the Given data;

Using Excel with the function : TINV(0.01,19);

Critical value t* = 2.861

The margin of error can now be represented by the illustration:

Margin of error = t^* \sqrt{ \dfrac {s_1 ^2}{n_1} + \dfrac {s_2 ^2}{n_2}

Lower Limit =  (\bar x_1 - \bar x_2)- (Margin \ of \ error)

Upper Limit =  (\bar x_1 - \bar x_2)+ (Margin \ of \ error)

Thus; the confidence interval for the difference in the mean number of steps taken by all people like these that do and do not pay attention to the number of steps they take per day using df - 19 is:

\mathbf{(A)  \ 1596  \ \pm 2.861 \sqrt{ \dfrac{1580^2}{20} + \dfrac{2350^2}{20}}}

4 0
2 years ago
Below are summary statistics for the sizes (in acres) of some local vineyards. Using the summary statistics, complete parts (a)
rjkz [21]

Answer:

option B

Step-by-step explanation:

The symmetric distribution have close or approximate values of median and mean. In the given scenario mean is 48.5 and median is 33. We can see that the both values significantly differs. Also, given mean is greater than median(48.5>33) . Thus, the distribution is positively skewed and not symmetrical.

Hence, the distribution is skewed because mean and median significantly differ from each other.

3 0
2 years ago
The Ferris Wheel first appeared at the 1893 Chicago Exposition. Its axle was 45 feet long. Spokes radiated from it that supporte
AnnyKZ [126]
Well, not sure exactly what coordinates is expecting, but the 270° coming from the loading platform, would be like the picture below, and yes, all "standard position" angles go counterclockwise.


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Nataly_w [17]
10x4=40

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ANSWER:w=13 wrapers
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Which are the solutions of x2 = –13x – 4? 0, 13 0, –13
masha68 [24]
It's defiantly not C. I made a 90%  but missed this question. I hope this helps you cross it down.  My next guess would be D.

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