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Kaylis [27]
2 years ago
8

Is the answer is b ? Help

Mathematics
1 answer:
PilotLPTM [1.2K]2 years ago
6 0

Answer:

No, it is D.

Step-by-step explanation:

<em>It can not be A or C, because length can not be negative</em>

Because the y is the same, you only have to <em>count the distance of the x-axises</em>.

4 - (-3) is 7 units, which is D.

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A researcher is interested in whether people are less able to identify emotions correctly when they are extremely tired. It is k
stepan [7]
<h2>Answer with explanation:</h2>

Let \mu be the population mean.

By analyzing the given information, we have the following hypothesis:-

H_0:\mu\geq81\\\\H_a:\mu

Since the alternative hypotheses is left tailed so the test is a right-tailed test.

Also, the  accuracy ratings of people in the general population are normally distributed.

Given : Sample size :  n=51 , since n>30 so we use z-test.

Sample mean : \overline{x}=79

Standard deviation : \sigma=\sqrt{20}\approx4.47

Test statistic for population mean :-

z=\dfrac{\overline{x}-\mu}{\dfrac{\sigma}{\sqrt{n}}}

\Rightarrow\ z=\dfrac{79-81}{\dfrac{4.47}{\sqrt{51}}}\\\\\Rightarrow\ z\approx-3.195

Critical value (one-tailed) corresponds to the given significance level :-

z_{\alpha}=z_{0.05}=1.645

Since the observed value of z (-3.195) is less than the critical value (1.645) , so we do not reject the null hypothesis.

Hence, we conclude that we do not have enough evidence to accept that people are less able to identify emotions correctly when they are extremely tired .

3 0
3 years ago
Explain how knowing 50×4 helps you find 500×400
Andre45 [30]
5x4= 20
50x40=200
500x400=200000
Do you see the pattern? 5x4=20, which means that all you need to do is add the zeros. 50x40 has two zeros, which means it should equal 200.
8 0
2 years ago
John is planning a 250 mile long road trip. His car gets 32 miles per gallon on the highway. Gas costs $3.50 a gallon. How much
lapo4ka [179]

Answer:

$27.34

Step-by-step explanation:

250 miles divided by 32 miles per gallon equals 7.8125  which is the number of gallons needed.    Then multiple 7.8125 by the cost per gallon $3.50 to determine the cost of the fuel needed.    

7 0
2 years ago
Balanced force acting on a 4.0 kg object will produce an acceleration of 8.0 m/s?
tekilochka [14]

Answer:

<h2>F=ma</h2><h3>mass:4kg </h3><h3>acceleration:8m/s²</h3><h3>F=4 x 8</h3><h3>F= 32N</h3>
6 0
2 years ago
Solve 5/4y-18=y/2<br> pls solve it <br> i'll mark you as brainliest
Volgvan

Answer:

y = 24

Step-by-step explanation:

5/4y-18=y/2

Multiply by 4 on all sides to get rid of the fractions

4(5/4y-18)=4*y/2

5y - 72 =2y

Subtract 5y from each side

5y-5y - 72 =2y-5y

-72 = -3y

Divide by -3

-72/-3 = -3y/-3

24 =y

5 0
3 years ago
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