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3 years ago

The question is on the screenshot, thanks

Mathematics

2 answers:

NeTakaya3 years ago

8 0

Answer

It is B because Q rotate with 180 degree so if it rotates again with 180 degree it ends on point B

Step-by-step explanation:

timofeeve [1]3 years ago

5 0

Answer:

Point B

Step-by-step explanation:

A 180 degree turn means that the point practically reflects over the y-axis. The number of spaces away from (0,0) that Point Q was originally is the number of spaces that Point Q will still be from (0,0). Point Q, like already said, will just be on the other side of the y-axis. Point Q's original coordinates were (0,-4), which means that point Q was originally 4 units away from (0,0) on the x-axis on the left side of the y-axis. That means with a 180 degree transformation, Point Q will be still 4 units away from (0,0) on the x-axis, but on the right side of the y-axis. The new coordinate pair for Point Q would be (0,4), which is also where Point B is plotted on the graph. Therefore, Point B would be the new image of Point Q.

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7 measured data points have a sample mean of 1403 and a standard deviation of 27. Determine the best estimate of the mean value

mina [271]

Answer:

Step-by-step explanation:

Hello!

You have sample of n=7 with mean X[bar]= 1403 and standard deviation S=27 and are required to estimate the mean with a 95%CI.

Asuming this sample comes from a normal population I'll use a stuent t to estimate the interval (a sample of 7 units is too small for the standard normal to be accurate for the estimation):

[X[bar]± $t_{n-1;1-\alpha /2}$ * $\frac{S}{\sqrt{n} }$ ]

$t_{n-1;1-\alpha /2} = t_{6;0.975}= 2.365$

[1403±2.365* $\frac{27}{\sqrt{7} }$ ]

[1378.87;1427.13]

The margin of error is the semiamplitude of the interval and you can calculate it as:

$d= \frac{Upbond-Lowbond}{2}= \frac{1427.13-1378.87}{2} = 24.13$

With a confidence level of 95% you'd expect that the real value of the mean is contained by the interval [1378.87;1427.13], the best estimate of the mean value is expected to be ± 24.13 of 1403.

I hope it helps!

4 0

3 years ago

What value is added to both sides of the equation x2 − 4x = −2 in order to solve by completing the square? 4, 2 , −2 , −4

Fiesta28 [93]

X^2 - 4 x = -2
Add 4 to both sides:
x^2 - 4 x + 4 = 2
Write the left-hand side as a square:
(x - 2)^2 = 2
Take the square root of both sides:
x - 2 = sqrt(2) or x - 2 = -sqrt(2)
Add 2 to both sides:
x = 2 + sqrt(2) or x - 2 = -sqrt(2)
Add 2 to both sides:
Answer: x = 2 + sqrt(2) or x = 2 - sqrt(2)

6 0

3 years ago

Which shows an angle that is approximately 40 degrees.

ICE Princess25 [194]

It is a acute I think that is the answer I am in 7th grade so I don’t really know

5 0

3 years ago

Samantha buys a car for $19,000. Looking on Kelley Blue Book, she realized that

Yuri [45]

Answer:

$16,150

Step-by-step explanation:

hope this helps with the work

4 0

3 years ago

Help me with this problem!

Vanyuwa [196]

Answer:

a. 208.5 ft.

b. 144.9 ft.

Both correct to the nearest tenth.

Step-by-step explanation:

(a) sin 46 = 150 / h where h is the length of the wire.

h = 150/ sin 46

= 208.5 ft.

(b) tan 46 = 150 / x where x is the distance required.

x = 150 / tan 46

x = 144.9 ft.

7 0

4 years ago