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2 years ago

PLS HELP ILL GIVE BRAINLY AND 30 PTS

Mathematics

2 answers:

kvv77 [185]2 years ago

8 0

Answer:

C. These lines are perpendicular

Step-by-step explanation:

frosja888 [35]2 years ago

5 0

Answer:

C. the lines are perpendicular

Step-by-step explanation:

you can tell right away they're perpendicular because the slope gets flipped and changed the sign for in the second equation

2/3 going to -3/2 or vice versa means they are perpendicular

if they had the same slope they would have been parallel

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Help me in algebra please I need it done 100% correct only :(

Jet001 [13]

Use a and c because you need to know the description and relationship between a-b to get your end result

6 0

3 years ago

Which group was founded to prevent African Americans from exercising their civil rights? the Whig Party the Ku Klux Klan the Pop

Cloud [144]

The group founded to prevent African Americans from exercising their civil rights was the Ku Klux Klan.

<u>Explanation:</u>

The Civil Rights Act of 1866 made African Americans(Radical Republicans) citizens of the US, prohibiting them from discriminating, which must be enforced in federal courts.

The Ku Klux Klan, generally known as the KKK or Klan, is an American white supremacist party that has the main goal of targeting the African people. The three eras of Klan are namely,

First Klan: 1865–1871

Second Klan: 1915–1944

Later Klans: 1950s–present

Each era has favored radical reactionary positions, such as white nationalism, anti-immigration and, in particular, the subsequent revivalism: Nordism and anti-Catholicism.

3 0

2 years ago

Read 2 more answers

List two numbers that are divisible by 9?

atroni [7]

Answer:

3, 6, 12, 15

Step-by-step explanation:

3/12= 4

3/9= 3

7 0

2 years ago

The office manager of First Tech Support borrowed $25,000 to purchase new computers for employees. The bank charges 6 percent in

Travka [436]

Given:

Amount borrowed (P)= $25000

Rate of interest (r)= 6%

Time (t)= 4 years.

To find:

The total interest the company pay in all.

Solution:

We know that,

$A=P(1+r)^t$

where, A is amount, P is principal, r is rate of interest and t is time period.

$A=25000(1+\dfrac{6}{100})^4$

$A=25000(1.06)^4$

$A=25000(1.26247696)$

$A=31561.924
$

Now,

$I=A-P$

$I=31561.924-25000$

$I=6561.924$

Therefore, the total interest is $6561.924.

7 0

3 years ago

A recent survey describes the total sleep time per night among college students as approximately Normally distributed with mean

marin [14]

Answer:

a) $\sigma_{\bar X}= \frac{1.26}{\sqrt{165}}= 0.0981$

b) We expect 68% of the values between : (6.6219, 6.8181)

We expect 95% of the values between : (6.5238, 6.9162)

We expect 99.7% of the values between : (6.4257, 7.0143)

c) $z = \frac{6.9-6.72}{0.0981}= 1.835$

And we can use the z normal table or excel and we got:

$P(Z$

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".

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

$X \sim N(6.72,1.26)$

Where $\mu=6.72$ and $\sigma=1.26$

(a) What is the standard deviation for the average time in hours? (Round your answer to four decimal places.)

For this case the sample mean have the following distirbution

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And the deviation is given by:

$\sigma_{\bar X}= \frac{1.26}{\sqrt{165}}= 0.0981$

in minutes?= (Round your answer to three decimal places.)

(b) Use the 95 part of the 68–95–99.7 rule to describe the variability of this sample mean. (Round your answer to four decimal places.)

The empirical rule, also known as three-sigma rule or 68-95-99.7 rule, "is a statistical rule which states that for a normal distribution, almost all data falls within three standard deviations (denoted by σ) of the mean (denoted by µ)".

• The probability of obtain values within one deviation from the mean is 0.68

• The probability of obtain values within two deviation's from the mean is 0.95

• The probability of obtain values within three deviation's from the mean is 0.997

We expect 68% of the values between : (6.6219, 6.8181)

We expect 95% of the values between : (6.5238, 6.9162)

We expect 99.7% of the values between : (6.4257, 7.0143)

(c) What is the probability that your average will be below 6.9 hours? (Round your answer to four decimal places.)

For this case we can use the z score formula given by:

$z = \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}$

And we can find the z score for 6.9 and we got:

$z = \frac{6.9-6.72}{0.0981}= 1.835$

And we can use the z normal table or excel and we got:

$P(Z$

4 0

2 years ago