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Anika [276]
3 years ago
10

Simplify x

6x - 12" alt=" {x}^{2} + 6x - 12" align="absmiddle" class="latex-formula">
​
Mathematics
1 answer:
OverLord2011 [107]3 years ago
8 0

Answer: x=8

Step-by-step explanation:

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Help !!!!!!!!!!!!!!!!
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Answer:

Hey there!

5(v+3)-10v>-10

5v+15-10v>-10

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1) What is the total cost of order<br> number one if you include 4.5% sales tax<br> and a 20% tip?
svetoff [14.1K]

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Step-by-step explanation:

you add $10.00 to 4.5% which gives you $10.45

and then you add 20% on to that and you get $12.54

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What is the answer to 3(x+4)=5x+14
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X = -1
Here’s my work :

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3 years ago
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Given the following data set 2,3,1,6,1,1,1,0,2,4,5,1,2,2,3<br>Mean <br>Median <br>Range<br>Mid range
igomit [66]

Answer:

mean: 34/15=2.27

median: 2

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3 years ago
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A statistician selected a random sample of 125 observations from a population with a known standard deviation equal to 16 and co
serious [3.7K]

Answer:

Step-by-step explanation:

Given that a statistician selected a random sample of 125 observations from a population with a known standard deviation equal to 16 and computed a sample mean equal to 77

We can use Z critical values since population std deviation is known. Also sample size >30

We find std error of mean = \frac{16}{\sqrt{125} } \\=1.4311

Margin of error = Z critical value * 1.4311

Z critical values for 93% = 1.81

for 89% = 1.60

n Std error Z critical  Conf interval  

            89%    

     

125 1.4311     1.6  (74.71024 79.28976 )

     

     

          93%    

            1.81  (74.409709 79.590291 )

We find that when confidence level increases interval width increses.

c) When sigma changes to 441, std error changes to \frac{16}{\sqrt{441} } \\=0.7619

So we get

n Std error Z critical  Conf interval  

           89%    

     

441  0.7619     1.6  (75.781 78.219 )

     

     

         93%    

           1.81  (75.621 78.37904)

d) When n = 625, std error changes to 16/25 = 0.64

n Std error Z critical  Conf interval  

        89%    

     

441 0.64 1.6        (75.976 78.024 )

     

     

       93%    

        1.81      (75.842 78.1584)

When sample size increases, confidence interval width decreases.

8 0
3 years ago
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