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
aivan3 [116]
3 years ago
14

Please help me with these and please have explanations

Mathematics
1 answer:
NeTakaya3 years ago
6 0

Answer:

1-B

2-C

3-D

Step-by-step explanation:

In the attached file

You might be interested in
Find the values of x and z
Ad libitum [116K]
Hope this helps you, and good luck in the future :)

4 0
3 years ago
Offering 20 points to whoever answers all of themmmmmmm!
s2008m [1.1K]

Answer:

The first is 30

Step-by-step explanation:

The third is 115

7 0
3 years ago
Read 2 more answers
One fourth of a box of cereal was shared equally among 3 people. How much cereal did each person get? Explain how you got your a
Mila [183]
Each person gets 0.083333..... of the box of cereal. i got my answer by dividing 0.25 or 1/4 by three and the answer was 0.083333 repeating.
6 0
3 years ago
You estimated the average rental cost of a 2 bedroom apartment in Denton. A random sample of 16 apartments was taken. The sample
Zigmanuir [339]

Answer:

The new sample size required in order to have the same confidence 95% and reduce the margin of erro to $60 is:

n=28

Step-by-step explanation:

The margin of error is the range of values below and above the sample statistic in a confidence interval.  

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".  

Assuming the X follows a normal distribution  

X \sim N(\mu, \sigma=160)  

And the distribution for \bar X is:

\bar X \sim N(\mu, \frac{160}{\sqrt{n}})  

We know that the margin of error for a confidence interval is given by:  

Me=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}   (1)  

The next step would be find the value of \z_{\alpha/2}, \alpha=1-0.95=0.05 and \alpha/2=0.025  

Using the normal standard table, excel or a calculator we see that:  

z_{\alpha/2}=\pm 1.96  

If we solve for n from formula (1) we got:  

\sqrt{n}=\frac{z_{\alpha/2} \sigma}{Me}  

n=(\frac{z_{\alpha/2} \sigma}{Me})^2  

And we have everything to replace into the formula:  

n=(\frac{1.96(160)}{78.4})^2 =16  

And this value agrees with the sample size given.

For the case of the problem we ar einterested on Me= $60, and we need to find the new sample size required to mantain the confidence level at 95%. We know that n is given by this formula:

n=(\frac{z_{\alpha/2} \sigma}{Me})^2  

And now we can replace the new value of Me and see what we got, like this:

n=(\frac{1.96*160}{60})^2 =27.32

And if we round up the answer we see that the value of n to ensure the margin of error required Me=\pm 60 $ is n=28.    

5 0
3 years ago
Factor 81x²-25. Remember there is no middle term. This is a sum and difference of 2 squares.
natulia [17]

Hey there!!

Basic formula :

... a² - b² = ( a + b ) ( a - b )

Equation given :

... 81x² - 25

... ( 9x )² - ( 5 )²

... ( 9x + 5 ) ( 9x - 5 )

Hope it helps!!

5 0
3 years ago
Other questions:
  • Can someone help me figure out what 40% of 65 is?​
    8·2 answers
  • Colby wants to set up square tiles on the top of a wooden box. The top of the wooden box is a rectangle 7 1/2 inches long and 5
    8·1 answer
  • What is bigger?? 2.5 feet or 32 inches?
    15·2 answers
  • What's the square root of 68?
    9·1 answer
  • Which of these equations have no solution? Check all thal apply.
    5·2 answers
  • Which graph shows the solution to the system of linear inequalities?
    11·2 answers
  • PLEASE HELP ASAP worth alot
    7·1 answer
  • I need help with this <br><br> look at picture <br><br> Complementary angles
    14·1 answer
  • While organizing the magazines at the doctor's office, Camille put 12 magazines in the first pile, 15 magazines in the second pi
    9·1 answer
  • For for every ten sheets of stickers you buy at a craft store the total cost increases $20.50
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!