1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
myrzilka [38]
2 years ago
9

I need help please tell me how to get the answer and the answer please

Mathematics
1 answer:
MrRa [10]2 years ago
4 0

Answer:

zero

Step-by-step explanation:

because when u equate both equation ,

-2x-5= -2x+7

or, -2x+2x=7+5

or, 0=12

which is invalid so it has no solution

You might be interested in
64 percent of the animals shelter are dogs about what fraction of the animals at the shelter are dogs
Lilit [14]
I think it would be 64/100 because 64 percent is most likely out of 100 percent

3 0
3 years ago
A medical researcher wondered if there is a significant difference between the mean birth weight of boy and girl babies. Random
Yuliya22 [10]

Answer:

b) independent samples t-test

t=\frac{(5.92 -5.74)-(0)}{\sqrt{\frac{1.88^2}{5}}+\frac{1.81^2}{5}}=0.154  

p_v =2*P(t_{8}>0.154) =0.881  

So with the p value obtained and using the significance level given \alpha=0.05 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the mean of the group 1 (boys) is NOT significantly different than the mean for the group 2 (Girls).  

Step-by-step explanation:

The system of hypothesis on this case are:  

Null hypothesis: \mu_1 = \mu_2  

Alternative hypothesis: \mu_1 \neq \mu_2  

Or equivalently:  

Null hypothesis: \mu_1 - \mu_2 = 0  

Alternative hypothesis: \mu_1 -\mu_2\neq 0  

Our notation on this case :  

n_1 =5 represent the sample size for group 1  

n_2 =5 represent the sample size for group 2  

We can calculate the mean and deviation for eaach group with the following formulas:

\bar X= \frac{\sum_{i=1}^n X_i}{n}

s = \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}

\bar X_1 =5.92 represent the sample mean for the group 1  

\bar X_2 =5.74 represent the sample mean for the group 2  

s_1=1.88 represent the sample standard deviation for group 1  

s_2=1.81 represent the sample standard deviation for group 2  

If we see the alternative hypothesis we see that we are conducting a bilateral test and with independnet samples t test.

b) independent samples t-test

The statistic is given by this formula:  

t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{\sqrt{\frac{s^2_1}{n_1}}+\frac{S^2_2}{n_2}}  

And now we can calculate the statistic:  

t=\frac{(5.92 -5.74)-(0)}{\sqrt{\frac{1.88^2}{5}}+\frac{1.81^2}{5}}=0.154  

The degrees of freedom are given by:  

df=5+5-2=8

And now we can calculate the p value using the altenative hypothesis:  

p_v =2*P(t_{8}>0.154) =0.881  

So with the p value obtained and using the significance level given \alpha=0.05 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the mean of the group 1 (boys) is NOT significantly different than the mean for the group 2 (Girls).  

7 0
3 years ago
Write each ratio statement as a fraction and reduce the two lowest terms 14:42
LuckyWell [14K]
<span>14:42 = 14/42 = 1/3 
</span>This ones right sorry answered wrong question lol
7 0
3 years ago
Read 2 more answers
Need help with this <br> (I think it’s 49 but I’m not sure)
faust18 [17]

Answer:

Its 49

Step-by-step explanation:

Can i get brainliest

3 0
3 years ago
A Web music store offers two versions of a popular song. The size of the standard version is 2.4 megabytes (MB). The size of the
ANEK [815]

Answer:

50.mb

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • !!!!Which ordered pair in the form of (x, y) are solutions to the equation 7x - 5y =28
    11·1 answer
  • PLS HELP ASAP WILL MARK BRAINLIST !! :))
    5·2 answers
  • Please help me understand how to do this
    10·2 answers
  • How many tenths in 3.7
    8·2 answers
  • Geometry math question
    12·2 answers
  • The vertices of a square are located at:
    12·2 answers
  • Why do we have to do school<br>​
    8·1 answer
  • A number tripled and tripled again is 576. What is the number?
    12·2 answers
  • GIVING BRAINLIEST!!!!!!!
    5·1 answer
  • Paul made $70 shoveling snow and $25 salting driveways. He set 35% of his total earnings aside for taxes. How much did he set as
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!