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Serhud [2]
3 years ago
11

a store bought a diamond ring at a cost of 8000 and marked it up 25%.Tommy bought it and paid 15% sales tax.what was his total c

ost?
Mathematics
1 answer:
kirza4 [7]3 years ago
5 0
You do 8000×.25 to get 2000
then add 8000 to 2000 to get 10000
then multiply 10000 by .15 to get 1500
then add 10000 to 1500 to get your answer which is 11500
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What is the value of 30-2(7+2)-1?<br> A. 11<br> B.14<br> C.17<br> D. 19<br> HURRYYYU
OLEGan [10]

Answer:

11

Step-by-step explanation:

30-2(7+2)-1

PEMDAS says parentheses first

30-2(9)-1

Then multiply

30 -18 -1

Then subtract

12-1

11

7 0
3 years ago
Read 2 more answers
A 95% confidence interval for a population mean is computed from a sample of size 400. Another 95% confidence interval will be c
Anna [14]

Answer:

The interval from the sample of size 400 will be approximately <u>One -half as wide</u> as the interval from the sample of size 100

Step-by-step explanation:

From the question we are told the confidence level is  95% , hence the level of significance is    

      \alpha = (100 - 95 ) \%

=>   \alpha = 0.05

Generally from the normal distribution table the critical value  of  \frac{\alpha }{2} is  

   Z_{\frac{\alpha }{2} } =  1.96

Generally the 95% confidence interval is dependent on the value of the margin of error at a constant sample mean or sample proportion

Generally the margin of error is mathematically represented as

      E = Z_{\frac{\alpha }{2} } * \frac{\sigma}{\sqrt{n} }    

Here assume that Z_{\frac{\alpha }{2} } \ and \  \sigma \ is constant so

     E =  \frac{k}{\sqrt{n} }

=>  E \sqrt{n} = K

=>   E_1 \sqrt{n}_1 =  E_2 \sqrt{n}_2

So  let  n_1 = 400 and n_2 =  100

=>   E_1 \sqrt{400} =  E_2 \sqrt{100}

=>  E_1 =  \frac{\sqrt{100} }{\sqrt{400} } E_2

=>  E_1 =  \frac{1}{2 } E_2

So From this we see that  the confidence interval for a sample size of 400 will be half that with a sample size of 100

   

     

   

7 0
2 years ago
A group of 5 friends shares 35 pieces of candy equally. How many pieces of candy does each friend receive?​
artcher [175]

Divide total pieces of candy by total people:

35 / 5 = 7

Each person receives 7 pieces of candy

7 0
3 years ago
Read 2 more answers
In the diagram, two parallel lines are cut by a transversal. which angles are congruent to ∠8?
mina [271]
Thank you for posting your question here at brainly. Feel free to ask more questions.  
<span><span>The best and most correct answer among the choices provided by the question is  </span>c)∠1,∠4, and ∠5.</span>             <span><span>

</span><span>Hope my answer would be a great help for you. </span> </span>
7 0
3 years ago
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Please assist me<br><br>NO LINKS!!<br>​
Nana76 [90]

Answer:

See below:

Step-by-step explanation:

Hello! My name is Galaxy and I will be helping you today, I hope you are having a nice day!

We can solve this in two steps, Comprehension and Solving. I'll go ahead and start with Comprehension.

If you have any questions feel free to ask away!!

Comprehension

We know according to the laws of geometry that all angles in a triangle add up to 180 degrees.

We also know that in an isosceles angle, the base angles are equation to each other.

Now that we know what we need to know, we can setup an equation.

2x-6+(2x)=180

We can do this because first of all, we know that 2x-6 is one of the angles and as per the base angles of an isosceles triangle we know that both base angles are x, therefore we can add 2x to get 180 degrees.

I'll start solving now.

Solving

We can solve this by using the equation we made above and solving it with algebra.

2x-6+2x=180\\4x-6=180\\4x=186\\x=46.5

We know that x is equal to 46.5 degrees. We can check that by inputting it into the equation.

2(46.5)-6+2(46.5)=180?\\4(46.5)=186?\\46.5=46.5

We've proven that our answer is correct by double checking,

Therefore the answer is 46.5!

Cheers!

4 0
3 years ago
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