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BigorU [14]
2 years ago
14

Help I'll give you 100 points

Mathematics
2 answers:
Dvinal [7]2 years ago
7 0

✏ Answer:

y=-9

Step-by-step explanation:

2-\frac{1}{8}y=11+\frac{7}{8}y

<u>➠</u><u> Subtract 2 from both sides:-</u>

<u />2-\frac{1}{8}y-2=11+\frac{7}{8}y-2

-\frac{1}{8}y=\frac{7}{8}y+9

<u>➠</u><u> Subtract 7/8y  from both sides:-</u>

<u />-\frac{1}{8}y-\frac{7}{8}y=\frac{7}{8}y+9-\frac{7}{8}y

-y=9

<u>➠</u><u> Divide both sides by -1:-</u>

<u />\frac{-y}{-1}=\frac{9}{-1}

y=-9

<u>OAmalOHopeO</u>

<u>✎--------------------------</u>

fgiga [73]2 years ago
5 0

\huge \boxed{\mathfrak{Question} \downarrow}

  • \tt \: 2 - \frac { 1 } { 8 } y = 11 + \frac { 7 } { 8 } y \\

\large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}

\tt \: 2 - \frac { 1 } { 8 } y = 11 + \frac { 7 } { 8 } y \\

Subtract \tt\frac{7}{8}y from both sides.

\tt \: 2-\frac{1}{8}y-\frac{7}{8}y=11 \\

Combine \tt-\frac{1}{8}y and \tt-\frac{7}{8}y to get -y.

\tt \: 2-y=11

Subtract 2 from both sides.

\tt \: -y=11-2

Subtract 2 from 11 to get 9.

\tt \: -y=9

Multiply both sides by -1.

\boxed{\boxed{ \bf \: y=-9 }}

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emmainna [20.7K]

Answer:

(0, 1)

Step-by-step explanation:

All other choices do not match the two possible vertices of the square.

4 0
3 years ago
I need to know what the answer is
wel
(x/2)-(5x/6)=1/9
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Andru [333]

Yes because it goes up and back down

4 0
3 years ago
SAT scores are normed so that, in any year, the mean of the verbal or math test should be 500 and the standard deviation 100. as
vovangra [49]

Answer:

a) P(X>625)=P(\frac{X-\mu}{\sigma}>\frac{625-\mu}{\sigma})=P(Z>\frac{625-500}{100})=P(Z>1.25)

P(Z>1.25)=1-P(Z

b) P(400

P(-1

P(-1

c) z=-0.842

And if we solve for a we got

a=500 -0.842*100=415.8

So the value of height that separates the bottom 20% of data from the top 80% is 415.8.  

Step-by-step explanation:

Previous concepts

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".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Part a

Let X the random variable that represent the SAT scores of a population, and for this case we know the distribution for X is given by:

X \sim N(500,100)  

Where \mu=500 and \sigma=100

We are interested on this probability

P(X>625)

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(X>625)=P(\frac{X-\mu}{\sigma}>\frac{625-\mu}{\sigma})=P(Z>\frac{625-500}{100})=P(Z>1.25)

And we can find this probability using the complement rule and with the normal standard table or excel:

P(Z>1.25)=1-P(Z

Part b

We are interested on this probability

P(400

And the best way to solve this problem is using the normal standard distribution and the z score given by:

z=\frac{x-\mu}{\sigma}

If we apply this formula to our probability we got this:

P(400

And we can find this probability with this difference:

P(-1

And in order to find these probabilities we can find tables for the normal standard distribution, excel or a calculator.  

P(-1

Part c

For this part we want to find a value a, such that we satisfy this condition:

P(X>a)=0.8   (a)

P(X   (b)

Both conditions are equivalent on this case. We can use the z score again in order to find the value a.  

As we can see on the figure attached the z value that satisfy the condition with 0.2 of the area on the left and 0.8 of the area on the right it's z=-0.842. On this case P(Z<-0.842)=0.2 and P(Z>-0.842)=0.8

If we use condition (b) from previous we have this:

P(X  

P(z

But we know which value of z satisfy the previous equation so then we can do this:

z=-0.842

And if we solve for a we got

a=500 -0.842*100=415.8

So the value of height that separates the bottom 20% of data from the top 80% is 415.8.  

8 0
3 years ago
Answer and I will give you brainiliest <br><br><br><br>MATH ​
cricket20 [7]

Answer: 13

Step-by-step explanation: The parabola intersects the y axis at y=13

6 0
3 years ago
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