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Nookie1986 [14]
3 years ago
12

​ ​ ​ ​​ ​−9x+3y=27 ​8x+8y=40 ​​

Mathematics
1 answer:
kykrilka [37]3 years ago
7 0
Well first move the x's over to get 9X+27=3y and -8x+40=8y. Now just divide to isolate the y . 3x+9= y and -X+5= y.
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i need help on this- It says on the top Which Division equation IS represented by the drawing below-°
IgorC [24]

Answer:

D im pretty sure

Step-by-step explanation:

If each line is 20 x 3 = 60 12 dots 60 + 12 = 72 divided by 3 circles = 24

3 0
2 years ago
The number of major earthquakes in a year is approximately normally distributed with a mean of 20.8 and a standard deviation of
SCORPION-xisa [38]

Answer:

a) 51.60% probability that in a given year there will be less than 21 earthquakes.

b) 49.35% probability that in a given year there will be between 18 and 23 earthquakes.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 20.8, \sigma = 4.5

a) Find the probability that in a given year there will be less than 21 earthquakes.

This is the pvalue of Z when X = 21. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{21 - 20.8}{4.5}

Z = 0.04

Z = 0.04 has a pvalue of 0.5160.

So there is a 51.60% probability that in a given year there will be less than 21 earthquakes.

b) Find the probability that in a given year there will be between 18 and 23 earthquakes.

This is the pvalue of Z when X = 23 subtracted by the pvalue of Z when X = 18. So:

X = 23

Z = \frac{X - \mu}{\sigma}

Z = \frac{23 - 20.8}{4.5}

Z = 0.71

Z = 0.71 has a pvalue of 0.7611

X = 18

Z = \frac{X - \mu}{\sigma}

Z = \frac{18 - 20.8}{4.5}

Z = -0.62

Z = -0.62 has a pvalue of 0.2676

So there is a 0.7611 - 0.2676 = 0.4935 = 49.35% probability that in a given year there will be between 18 and 23 earthquakes.

5 0
3 years ago
MARKING BRAINLIST! A blu-ray has a circumference of 25.12 inches. What is the radius of the blu-ray?
Genrish500 [490]

Answer: 3.99797217..

Step-by-step explanation:

formula for the circumference is pi x diameter

divide circumference by pi

25.12/pi = 7.9959443...

divide that by two to get the radius which would be 3.997972...

6 0
3 years ago
Urgent!! Math help!! What’s the answer?
Svetllana [295]

Answer:

Shift cos 0.9272

Gives 21.99 degrees near to 22

5 0
3 years ago
Find the distance between (4,2) and (-4,-4)
VikaD [51]
Use the distance formula, and plug in values.
d = \sqrt{(x_{2}-x_{1} )^{2}+(y_{2}-y_{1} )^{2}}
<u />d = \sqrt{( -4-4 )^{2}+( -4-2 )^{2}}
d = \sqrt{( -8 )^{2}+( -6 )^{2}}
d = \sqrt{64+36}
d= \sqrt{100}

Therefore, the distance is equal to "10".




3 0
3 years ago
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