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lisabon 2012 [21]
3 years ago
5

HELP I NEED HELP ASAP

Mathematics
1 answer:
Volgvan3 years ago
7 0

the answer is b

X is a bigger number and the difference between x and y is 7, so x-y=7. And it says that the sum of two numbers is 31 so x+y=31

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What is -2•3x simplified?
Dmitriy789 [7]

Answer:

Multiply  

3  by  − 2 =− 6 x

Step-by-step explanation:

5 0
2 years ago
El equipo mixto de fútbol tiene cuatro veces más niños que niñas. Decimos quela razón del número de niños
makvit [3.9K]

Answer:

4 a 1

Step-by-step explanation:

Se lee "4 a 1"

4 0
3 years ago
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Show that 4x - x? – 7 is always<br> negative.<br><br><br><br><br> Help
Verizon [17]

                                          <em>Question No 7</em>

Answer:

Please check the explanation.

Step-by-step explanation:

Show that 4x - x² - 7 is always negative.

Given

4x - x² - 7

4x - x² - 7 is always negative because:

  • -x²-7 will alwas be negative for all the values of x,
  • The value of  - x² - 7 will always be less than 4x for all the values of x

Hence, 4x - x² - 7 is always negative

For example,

let suppose we enter x = 1

4(1)-1^{2} -7\\=4-1-7\\=4-8\\=-4

let suppose we enter x = -1

4(-1)-(-1)^{2} - 7\\= -4 - 1 - 7\\= -12

6 0
3 years ago
Solve the system using elimination<br><br> 2x+3y=14<br> x+5y=14
natali 33 [55]

Answer:

x = 4 , y = 2

Step-by-step explanation by elimination:

Solve the following system:

{2 x + 3 y = 14 | (equation 1)

x + 5 y = 14 | (equation 2)

Subtract 1/2 × (equation 1) from equation 2:

{2 x + 3 y = 14 | (equation 1)

0 x+(7 y)/2 = 7 | (equation 2)

Multiply equation 2 by 2/7:

{2 x + 3 y = 14 | (equation 1)

0 x+y = 2 | (equation 2)

Subtract 3 × (equation 2) from equation 1:

{2 x+0 y = 8 | (equation 1)

0 x+y = 2 | (equation 2)

Divide equation 1 by 2:

{x+0 y = 4 | (equation 1)

0 x+y = 2 | (equation 2)

Collect results:

Answer: {x = 4 , y = 2

4 0
3 years ago
Read 2 more answers
A data set includes data from student evaluations of courses. The summary statistics are nequals83​, x overbarequals3.32​, sequa
Andrews [41]

Answer:

Hypothesis

Null hypothesis:\mu =3.50    

Alternative hypothesis:\mu \neq 3.50    

Statistic

t=\frac{3.32-3.50}{\frac{0.56}{\sqrt{83}}}=-2.928    

P value

The degrees of freedom are given by:

df=n-1=83-1=82

And the p value would be given by:

p_v =2*P(t_{(82)}    

Conclusion

Since the p value is lower than the significance level of 0.05 we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly different from 3.5

Step-by-step explanation:

Information given

\bar X=3.32 represent the sample mean

s=0.56 represent the sample deviation

n=83 sample size    

\mu_o =3.5 represent the value to test

t would represent the statistic

p_v represent the p value

System of hypothesis

We want to verify if the true mean is equal to 3.5, the system of hypothesis are:    

Null hypothesis:\mu =3.50    

Alternative hypothesis:\mu \neq 3.50    

Statistic

The statistic would be given by:

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}} (1)    

Replacing we got:

t=\frac{3.32-3.50}{\frac{0.56}{\sqrt{83}}}=-2.928    

P value

The degrees of freedom are given by:

df=n-1=83-1=82

And the p value would be given by:

p_v =2*P(t_{(82)}    

Conclusion

Since the p value is lower than the significance level of 0.05 we have enough evidence to reject the null hypothesis and we can conclude that the true mean is significantly different from 3.5

8 0
2 years ago
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